https://script.spoken-tutorial.org/index.php?action=history&feed=atom&title=PERL%2FC2%2FVariables-in-Perl%2FEnglish PERL/C2/Variables-in-Perl/English - Revision history 2026-05-13T13:24:52Z Revision history for this page on the wiki MediaWiki 1.23.17 https://script.spoken-tutorial.org/index.php?title=PERL/C2/Variables-in-Perl/English&diff=3644&oldid=prev Sneha at 05:18, 15 April 2013 2013-04-15T05:18:39Z <p></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr style='vertical-align: top;'> <td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td> <td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 05:18, 15 April 2013</td> </tr><tr><td colspan="2" class="diff-lineno">Line 128:</td> <td colspan="2" class="diff-lineno">Line 128:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|&#160; Next, type</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|&#160; Next, type</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>'''print space double quote Value of variable is: dollar priority slash n double quote complete semicolon'''</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>'''print space double quote Value of variable is: dollar priority slash n double quote complete semicolon''' <ins class="diffchange diffchange-inline">and press enter</ins></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''slash n''' is the new line character.</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''slash n''' is the new line character.</div></td></tr> <tr><td colspan="2" class="diff-lineno">Line 162:</td> <td colspan="2" class="diff-lineno">Line 162:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|&#160; To compile this '''Perl''' script, on the '''Terminal'''</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|&#160; To compile this '''Perl''' script, on the '''Terminal'''</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>type <del class="diffchange diffchange-inline">the following command;</del></div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>type<ins class="diffchange diffchange-inline">:&#160; </ins></div></td></tr> <tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>&#160;</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''perl hyphen c variables dot pl'''</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''perl hyphen c variables dot pl'''</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td colspan="2" class="diff-lineno">Line 272:</td> <td colspan="2" class="diff-lineno">Line 271:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|&#160; &#160;</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|&#160; &#160;</div></td></tr> <tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>| <del class="diffchange diffchange-inline"> Now let </del>us learn how to declare multiple '''variables'''.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>| <ins class="diffchange diffchange-inline">Let </ins>us learn how to declare multiple '''variables'''.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>To do so open the new file in Text Editor.</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>To do so open the new file in Text Editor.</div></td></tr> <tr><td colspan="2" class="diff-lineno">Line 283:</td> <td colspan="2" class="diff-lineno">Line 282:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>and press '''Enter'''.</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>and press '''Enter'''.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|&#160; on'''Terminal''' type -</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|&#160; on'''Terminal''' type -</div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''gedit multivar dot pl space ampersand'''</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''gedit multivar dot pl space ampersand'''</div></td></tr> <tr><td colspan="2" class="diff-lineno">Line 368:</td> <td colspan="2" class="diff-lineno">Line 368:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''print “Addition: $addition”;'''</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''print “Addition: $addition”;'''</div></td></tr> <tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>|&#160; Once again, to print the value of the '''addition''', type</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>|&#160; Once again, to print the value of the <ins class="diffchange diffchange-inline">variable </ins>'''addition''', type</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''print double quote Addition is dollar addition slash n double quote complete semicolon'''</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''print double quote Addition is dollar addition slash n double quote complete semicolon'''</div></td></tr> <tr><td colspan="2" class="diff-lineno">Line 451:</td> <td colspan="2" class="diff-lineno">Line 451:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div># Declare a number '''variable'''. &#160;</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div># Declare a number '''variable'''. &#160;</div></td></tr> <tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Assign <del class="diffchange diffchange-inline">the value </del>10 to it. &#160;</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Assign <ins class="diffchange diffchange-inline"> </ins>10 to it. &#160;</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div># Print the '''variable''' declared.</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div># Print the '''variable''' declared.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div># Declare 2 '''string variables'''.</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div># Declare 2 '''string variables'''.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div># Assign these values to them - “Namaste ” and “India”. &#160;</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div># Assign these values to them - “Namaste ” and “India”. &#160;</div></td></tr> <tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Print those ''<del class="diffchange diffchange-inline">'string </del>variables''' one after the other.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Print those ''<ins class="diffchange diffchange-inline">2 </ins>variables''' one after the other.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> </table> Sneha https://script.spoken-tutorial.org/index.php?title=PERL/C2/Variables-in-Perl/English&diff=3362&oldid=prev Nancyvarkey at 07:59, 19 March 2013 2013-03-19T07:59:08Z <p></p> <a href="https://script.spoken-tutorial.org/index.php?title=PERL/C2/Variables-in-Perl/English&amp;diff=3362&amp;oldid=3339">Show changes</a> Nancyvarkey https://script.spoken-tutorial.org/index.php?title=PERL/C2/Variables-in-Perl/English&diff=3339&oldid=prev AmolBrahmankar at 13:14, 18 March 2013 2013-03-18T13:14:55Z <p></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr style='vertical-align: top;'> <td colspan='2' style="background-color: white; color:black; text-align: center;">← Older revision</td> <td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 13:14, 18 March 2013</td> </tr><tr><td colspan="2" class="diff-lineno">Line 20:</td> <td colspan="2" class="diff-lineno">Line 20:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Variables in '''Perl'''</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Variables in '''Perl'''</div></td></tr> <tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2">&#160;</td></tr> <tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Comments in '''Perl'''</del></div></td><td colspan="2">&#160;</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-</div></td></tr> </table> AmolBrahmankar https://script.spoken-tutorial.org/index.php?title=PERL/C2/Variables-in-Perl/English&diff=3338&oldid=prev AmolBrahmankar: Created page with ''''Title of script''': Variables in Perl '''Author: Amol''' '''Keywords: Variables in Perl, Video Tutorial, Scalars in Perl''' {| style="border-spacing:0;" | style="border:0…' 2013-03-18T12:34:08Z <p>Created page with &#039;&#039;&#039;&#039;Title of script&#039;&#039;&#039;: Variables in Perl &#039;&#039;&#039;Author: Amol&#039;&#039;&#039; &#039;&#039;&#039;Keywords: Variables in Perl, Video Tutorial, Scalars in Perl&#039;&#039;&#039; {| style=&quot;border-spacing:0;&quot; | style=&quot;border:0…&#039;</p> <p><b>New page</b></p><div>'''Title of script''': Variables in Perl<br /> <br /> '''Author: Amol'''<br /> <br /> '''Keywords: Variables in Perl, Video Tutorial, Scalars in Perl'''<br /> <br /> <br /> <br /> {| style=&quot;border-spacing:0;&quot;<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| &lt;center&gt;'''Visual Cue'''&lt;/center&gt;<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| &lt;center&gt;'''Narration'''&lt;/center&gt;<br /> <br /> |-<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| Slide<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| Welcome to the spoken tutorial on Variables in '''Perl'''. <br /> <br /> |-<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| Slide:Learning Objectives<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| In this tutorial, we will learn about<br /> <br /> Variables in '''Perl'''<br /> <br /> Comments in '''Perl'''<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Slide:System Requirements<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| I am using '''Ubuntu Linux12.04''' operating system and <br /> <br /> '''Perl''' '''5.14.2 '''<br /> <br /> that is, '''Perl''' revision 5 version 14 and subversion 2<br /> <br /> <br /> I will also be using the '''gedit Text Editor'''. <br /> <br /> You can use any text editor of your choice.<br /> <br /> |-<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| Slide<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| Variables in '''Perl''':<br /> <br /> Variables are used for storing values, like text strings, numbers or arrays.<br /> <br /> Once a variable is declared, it can be used over and over again in the script.<br /> <br /> |-<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| Slide<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| Scalar represents a single value and can store scalars only.<br /> <br /> Scalar variables are declared using $ (dollar) symbol.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Slide<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Let us look at Variable Declaration:<br /> <br /> A variable can be declared as follows:<br /> <br /> '''dollar priority semicolon'''<br /> <br /> '''$priority;'''<br /> <br /> <br /> Variable names in '''Perl''' can have several formats. Variables must begin with a letter or underscore <br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Slide<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| And may contains letters, digits, underscores or a combination of above 3.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Slide<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Variables declared with CAPITAL letters have special meaning in '''Perl.''' <br /> <br /> So avoid declaring variables using Capital letters.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Switch to the Terminal and type<br /> <br /> '''gedit variables.pl &amp;'''<br /> <br /> and press '''Enter'''.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Now Open the '''Terminal''' and type <br /> <br /> '''gedit variables.pl &amp; '''<br /> <br /> <br /> '''The ampersand will unlock the command prompt on the terminal)'''<br /> <br /> Now press '''Enter'''.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Point to the filename '''variables.pl''' in the Titlebar of '''gedit'''.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| This will open the '''variables.pl '''file in gedit text editor.<br /> <br /> '''dot pl '''is the default extension of a '''Perl''' file.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Type the following<br /> <br /> '''$priority;'''<br /> <br /> and press '''Enter'''.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Type the following in the file;<br /> <br /> '''dollar priority semicolon'''<br /> <br /> '''$priority;'''<br /> <br /> and press '''Enter'''.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Highlight '''$priority; '''with the cursor<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| So we have declared the variable '''priority'''.<br /> <br /> You do not need to declare a variable before using it;<br /> <br /> you can just use it into your code. <br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Type<br /> <br /> '''$priority = 1;'''<br /> <br /> <br /> <br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Now let us assign a numerical value to the variable '''priority''' <br /> <br /> <br /> for this Type<br /> <br /> '''dollar priority space equal to space one semicolon'''<br /> <br /> '''$priority = 1;'''<br /> <br /> and press '''Enter'''.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Type<br /> <br /> '''print “Value of variable is: $priority”;'''<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Next, type<br /> <br /> '''print space double quote Value of variable is: dollar priority slash n double quote complete semicolon'''<br /> <br /> '''slash n is the new line character'''<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Save this file as '''variables.pl '''at any location of your choice.<br /> <br /> I am storing it in my home directory''' /home/amol.'''<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Now Save this file as '''variables.pl''' at any location.<br /> <br /> In my case, it will get saved in '''/home/amol '''directory. Now save this file<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Switch to the Terminal and type <br /> <br /> '''chmod 755 variables.pl '''<br /> <br /> explain the need of above line and then press '''Enter'''.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Now, let us change the permissions of '''variables.pl''' '''Perl '''file which we just created.<br /> <br /> To do so, on the '''Terminal''' type,<br /> <br /> '''chmod 755 variables.pl'''<br /> <br /> This will provide read, write &amp; execute rights to the file.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Switch to the Terminal and type<br /> <br /> '''perl -c variables.pl'''<br /> <br /> but don't press '''Enter''' yet.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| To compile this '''Perl''' script, on the '''Terminal'''.<br /> <br /> Type the following command;<br /> <br /> '''perl hyphen c variables dot pl'''<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Highlight '''-c''' using the cursor.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| '''Hyphen c '''switch compiles the '''Perl''' script for any compilation/syntax error.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Now press '''Enter''' <br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Now press enter<br /> <br /> This tells us that there is no syntax error in our script<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Highlight '''variables.pl syntax OK'''<br /> <br /> <br /> Type<br /> <br /> '''perl variables.pl'''<br /> <br /> and press '''Enter'''.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Now Let's execute the '''Perl''' script by typing<br /> <br /> '''perl variables dot pl'''<br /> <br /> and press '''Enter'''.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Point with the cursor to<br /> <br /> '''Value of variable is: 1'''<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| The output displayed is as highlighted<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Switch back to the Text editor window.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| We can also assign a string value to the variable we declared.<br /> <br /> Switch back to the Text editor window.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Highlight '''1'''&lt;nowiki&gt;; with the cursor&lt;/nowiki&gt;<br /> <br /> Instead of '''1''' type<br /> <br /> ''''high''''<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Instead of '''dollar priority equal to one;''' <br /> <br /> type<br /> <br /> '''dollar priority equal to in single quote high '''<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Point from right of '''&lt;nowiki&gt;= &lt;/nowiki&gt;'''to left.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Please note that assignments are evaluated from right to left.<br /> <br /> A '''scalar''' can hold data of any type, be it a string, a number <br /> <br /> |-<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| Switch to the Terminal and type<br /> <br /> '''perl -c variables.pl'''<br /> <br /> and press '''Enter'''.<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| Save this file and compile the script once again by typing<br /> <br /> <br /> '''perl hyphen c variables dot pl'''<br /> <br /> now press '''Enter'''.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Type<br /> <br /> '''perl variables.pl'''<br /> <br /> and press '''Enter'''.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| This tells us that there is no syntax error.<br /> <br /> <br /> Execute the script by typing<br /> <br /> '''perl variables dot pl'''<br /> <br /> and press '''Enter'''.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Point with the cursor to<br /> <br /> '''Value of variable is: high'''<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| The output is as shown<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Switch back to the Text editor window.<br /> <br /> Go to the last line and press '''Enter.'''<br /> <br /> Type <br /> <br /> '''$priority = “String”;'''<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Now Switch back to the Text Editor window.<br /> <br /> <br /> You can also use scalars within a double-quoted strings as<br /> <br /> '''dollar priority in double quote String'''<br /> <br /> <br /> Save this file and close it<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| <br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Now let us learn how to declare multiple variables.<br /> <br /> To do so open the new file in Text Editor.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Switch to the '''Terminal''' and type <br /> <br /> '''gedit multivar.pl &amp;'''<br /> <br /> and press '''Enter'''.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| on'''Terminal''' type -<br /> <br /> '''gedit multivar dot pl space &amp;'''<br /> <br /> and press '''Enter'''.<br /> <br /> <br /> This will open multivar dot pl file in text editor<br /> <br /> |-<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| Type<br /> <br /> '''$firstVar, $secondVar;'''<br /> <br /> and press '''Enter'''.<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| Now will type -<br /> <br /> '''dollar firstVar comma dollar secondVar semicolon'''<br /> <br /> and press '''Enter'''.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Type<br /> <br /> '''$firstVar = $secondVar;'''<br /> <br /> and press '''Enter'''.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| To copy the value of variable '''dollar firstVar''' to '''dollar secondVar''', type -<br /> <br /> '''dollar firstVar space equal to space dollar secondVar semicolon'''<br /> <br /> and press '''Enter'''.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Switch to slide<br /> <br /> <br /> <br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| All mathematical operations like addition, subtraction, multiplication, division, can be done on these variables <br /> <br /> Let us see how we can achieve this using '''Perl'''.<br /> <br /> |-<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| '''$firstVar = $secondVar =10;'''<br /> <br /> Press '''Enter'''.<br /> | style=&quot;border:0.5pt solid #000000;padding:0.106cm;&quot;| Switch to text editor and now Let us assign the value '''10''' to both these variables by typing '''dollar firstVar equal to dollar secondVar equal to ten semicolon'''.<br /> <br /> And Press '''Enter'''.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Type<br /> <br /> '''print “firstVar: $firstVar and secondVar: $secondVar”;'''<br /> <br /> and press '''Enter'''.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Now To print the values, type<br /> <br /> '''print double quote firstVar: dollar firstVar and secondVar: dollar secondVar slash n double quote complete semicolon''' press '''Enter'''.<br /> <br /> Now save this file.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Type<br /> <br /> '''$addition = $firstVar + $secondVar;'''<br /> <br /> Press '''Enter'''.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Now let us add the values in the two variables.<br /> <br /> For this type<br /> <br /> '''dollar addition space equal to space dollar firstVar plus space dollar secondVar semicolon'''<br /> <br /> and Press '''Enter'''.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Highlight the variable '''addition '''with the cursor <br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Notice, we haven't declared the variable '''addition'''.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Type<br /> <br /> '''print “Addition: $addition”;'''<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Once again to print the value of the addition, type<br /> <br /> '''print double quote Addition is dollar addition slash n double quote complete semicolon'''<br /> <br /> Save this file<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Switch to the Terminal and type<br /> <br /> '''perl -c variables.pl'''<br /> <br /> and press '''Enter'''.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| To compile this file again on terminal type<br /> <br /> '''perl hyphen c multivar dot pl'''<br /> <br /> there is no syntax error so<br /> <br /> we can execute the script by typing<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Type<br /> <br /> '''perl multivar.pl'''<br /> <br /> and press '''Enter'''.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| '''perl multivar dot pl'''<br /> <br /> <br /> <br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Point with the cursor to the output<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| This will produce an output as highlighted<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Pause the video recording here<br /> <br /> <br /> Type out the code for subtraction, multiplication and division in the '''multivar.pl''' file.<br /> <br /> <br /> Resume the video recording now<br /> <br /> <br /> Also, compile the code so that the output is displayed on the '''Terminal'''.<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| <br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Switch to '''gedit'''<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Similarly, try subtraction, multiplication and division.<br /> <br /> <br /> I have written the code here.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Close this file in '''gedit'''<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Now Let us save this file and close it.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Show the output in the '''terminal'''<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Now compile the file by typing<br /> <br /> perl hyphen c multivar dot pl<br /> <br /> There is no syntax error so we can execute the script as \<br /> <br /> perl multivar dot pl<br /> <br /> <br /> On execution the output will look like this<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Summary<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| This brings us to the end of this tutorial.<br /> <br /> In this tutorial we have learnt, <br /> <br /> To Declare and Use scalar variables in '''Perl'''<br /> <br /> <br /> <br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Assignment<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| '''Assignment'''<br /> <br /> # Declare a number variable. <br /> # Assign the value 10 to it. <br /> # Print the variable declared.<br /> # Declare 2 string variables.<br /> # Assign these values to them - “Namaste ” and “India”. <br /> # Print those string variables one after the other.<br /> <br /> <br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| About the Project<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Watch the video available at the following link <br /> <br /> It summarises the Spoken Tutorial project <br /> <br /> If you do not have good bandwidth, you can <br /> <br /> download and watch it <br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Spoken Tutorial Workshops <br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| The Spoken Tutorial Project Team <br /> <br /> Conducts workshops using spoken tutorials <br /> <br /> Gives certificates to those who pass an online <br /> <br /> test <br /> <br /> For more details, please write to <br /> <br /> contact at spoken tutorial dot org <br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Acknowledgment<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Spoken Tutorial Project is a part of the Talk to a <br /> <br /> Teacher project <br /> <br /> It is supported by the National Mission on <br /> <br /> Education through ICT, MHRD, Government <br /> <br /> of India <br /> <br /> More information on this Mission is available <br /> <br /> at the following link.<br /> <br /> |-<br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| <br /> | style=&quot;border-top:none;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:0.5pt solid #000000;padding:0.106cm;&quot;| Hope you enjoyed this '''Perl''' tutorial. This is Amol Brahmankar signing off.<br /> <br /> Thanks for joining.<br /> <br /> |}</div> AmolBrahmankar