Difference between revisions of "PERL/C2/Comments-in-Perl/English-timed"

From Script | Spoken-Tutorial
Jump to: navigation, search
Line 48: Line 48:
 
|-
 
|-
 
| 00:48
 
| 00:48
−
|* ''' Multi Line'''.
+
|* ''' Multi-Line'''.
 
|-
 
|-
 
|00:49
 
|00:49
Line 207: Line 207:
 
|-
 
|-
 
| 04:52
 
| 04:52
−
|  '''Please note''' there should not be any leading or trailing space(s) before '''= to''' sign and after the '''head''', '''cut''', '''begin''' or '''end''' word.
+
|  Please note, there should not be any leading or trailing space(s) before '''= to''' (equal to sign) and after the '''head''', '''cut''', '''begin''' or '''end''' word.
  
 
|-
 
|-
 
|05:02
 
|05:02
−
|   Open the '''Terminal''' once again.
+
| Open the '''Terminal''' once again.
  
 
|-
 
|-
 
| 05:05
 
| 05:05
−
|And Type - ''' gedit commentsExample dot pl space &''' and press '''Enter'''.
+
|And Type - ''' gedit commentsExample dot pl space &''' and press '''Enter'''.
  
 
|-
 
|-
Line 223: Line 223:
 
|-
 
|-
 
|05:19
 
|05:19
−
|Here I am declaring two variables '''firstNum '''and '''secondNum '''and I am assigning some values to them.
+
|Here, I am declaring two variables '''firstNum '''and '''secondNum '''and I am assigning some values to them.
  
 
|-
 
|-
Line 231: Line 231:
 
|-
 
|-
 
|05:32
 
|05:32
−
|Now I added these two numbers and assign the value to a third variable named addition.
+
|Now I added these two numbers and assign the value to a third variable named '''addition'''.
  
 
|-
 
|-
 
|05:39
 
|05:39
−
|Next I want to print the value using print command.
+
|Next, I want to print the value using print command.
  
 
|-
 
|-
Line 243: Line 243:
 
|-
 
|-
 
|05:49
 
|05:49
−
|On terminal type '''perl hyphen c commentsExample dot pl''', press '''Enter.'''
+
|On terminal, type: '''perl hyphen c commentsExample dot pl''', press '''Enter.'''
  
 
|-
 
|-
 
|05:57
 
|05:57
−
|There is no syntax error
+
|There is no syntax error.
  
 
|-
 
|-
 
|05:59
 
|05:59
−
|So execute the script by typing
+
|So, execute the script by typing
  
 
|-
 
|-
 
|06:01
 
|06:01
−
|'''perl commentsExample dot pl''' press enter
+
|'''perl commentsExample dot pl''' press '''Enter.'''
  
 
|-
 
|-
 
|06:07
 
|06:07
−
|  It will show the following output. '''Addition is 30'''
+
|  It will show the following output. '''Addition is 30'''.
  
 
|-
 
|-
Line 267: Line 267:
 
|-
 
|-
 
|06:16
 
|06:16
−
|Here we learnt, To Add Comments in '''Perl'''
+
|Here we learnt to add comments in '''Perl'''.
  
 
|-
 
|-
 
|06:19
 
|06:19
 
|Write a perl script to find square of a number.  
 
|Write a perl script to find square of a number.  
 +
 
|-
 
|-
 
|06:23
 
|06:23
−
|Explain the functionality of the code written using:  Single Line Comment & Mutli Line Comment.  
+
|Explain the functionality of the code written using '''single line comment''' & '''multiline Comment'''.  
  
 
|-
 
|-
 
| 06:30
 
| 06:30
−
| Watch the video available at the following link  
+
| Watch the video available at the following link.
  
 
|-
 
|-
 
|06:34
 
|06:34
−
|It summarises the Spoken Tutorial project  
+
|It summarizes the Spoken Tutorial project.
  
 
|-
 
|-
 
|06:37
 
|06:37
−
|If you do not have good bandwidth, you can  download and watch it  
+
|If you do not have good bandwidth, you can  download and watch it.
  
 
|-
 
|-
 
|  06:42
 
|  06:42
−
| The Spoken Tutorial Project Team  
+
|The Spoken Tutorial Project Team:
  
 
|-
 
|-
 
|06:44
 
|06:44
−
|Conducts workshops using spoken tutorials  
+
|Conducts workshops using spoken tutorials.
  
 
|-
 
|-
 
|06:48
 
|06:48
−
|Gives certificates to those who pass an online test  
+
|Gives certificates to those who pass an online test.
  
 
|-
 
|-
 
|06:51
 
|06:51
−
|For more details, please write to  contact at spoken hyphen tutorial dot org  
+
|For more details, please write to  contact at spoken hyphen tutorial dot org.
  
 
|-
 
|-
 
| 06:58
 
| 06:58
−
| Spoken Tutorial Project is a part of the Talk to a  Teacher project  
+
| Spoken Tutorial Project is a part of the Talk to a  Teacher project.
  
 
|-
 
|-
 
|07:03
 
|07:03
−
|It is supported by the National Mission on  Education through ICT, MHRD, Government  of India  
+
|It is supported by the National Mission on  Education through ICT, MHRD, Government  of India.
  
 
|-
 
|-
 
|07:11
 
|07:11
−
|More information on this Mission is available  at the following link.
+
|More information on this mission is available  at the following link.
  
 
|-
 
|-
 
| 07:15
 
| 07:15
−
|  Hope you enjoyed this '''Perl''' tutorial.  This is Amol Brahmankar signing off.
+
|  Hope you enjoyed this '''Perl''' tutorial.  This is Amol Brahmankar, signing off.
  
 
Thanks for joining.
 
Thanks for joining.
  
 
|}
 
|}

Revision as of 15:29, 7 May 2015

Time Narration
00:00 Welcome to the spoken tutorial on Comments in Perl.
00:05 In this tutorial, we will learn about
00:08 comments in Perl.
00:10 I am using Ubuntu Linux 12.04 operating system and Perl 5.14.2
00:18 that is, Perl revision 5 version 14 and subversion 2.
00:23 I will also be using the gedit Text Editor.
00:27 You can use any text editor of your choice.
00:31 You should have basic knowledge of compiling, executing and variables in Perl.
00:37 If not, please go through the relevant spoken tutorials on the spoken tutorial website.
00:43 Commenting a piece of code in Perl can be done in two ways:
00:47 * Single Line
00:48 * Multi-Line.
00:49 This type of comment is used when user wants to comment a single line of code or
00:55 to add one liner text to explain the functionality of a piece of code.
01:01 This type of comment starts with the symbol # (hash).
01:05 Here is a demo. Let us open a new file in the Text Editor.
01:11 Open the Terminal and type - gedit comments dot pl space &
01:19 Once again reminding you that the ampersand is used to free the command prompt in the terminal, now press Enter.
01:27 Now type the following commands.
01:29 hash Declaring count variable press Enter.
01:37 dollar count space equal to space 1 semicolon press Enter.
01:45 print space double quotes Count is dollar count slash n double quotes complete semicolon space hash Prints Count is 1
02:03 Now save this file by pressing Ctrl S and execute the Perl script.
02:08 Switch to the Terminal, and type perl hyphen c comments dot pl and press Enter.
02:18 This tells us that there is no syntax error.
02:21 Now type: perl comments dot pl and press Enter.
02:28 It will show the following output - Count is 1
02:33 Let us switch back to gedit.
02:36 In gedit, go to the first line and press Enter.
02:40 Go back to the first line and type the following command.
02:44 Hash exclamation mark slash usr slash bin slash perl
02:52 This line in Perl is called as shebang line and is the first line in a Perl program.
02:59 It tells where to find the Perl Interpreter.
03:03 Note: Though this line starts with hash symbol, it will not be considered as a single line comment by Perl.
03:11 Now let us look at multiline comments.
03:13 Multi Line: This type of comment is used
03:17 when user wants to comment a piece of code or to add description/usage of piece of code.
03:25 This type of comment starts with the symbol equal to head and ends with equal to cut.
03:33 Let's switch back to gedit and type the following in the comments dot pl file.
03:39 At the end of file, type: equal to head, press Enter.
03:45 print space double quote count variable is used for counting purpose double quote complete press Enter.
03:59 equal to cut
04:01 Save the file, close it and execute the Perl script.
04:05 On the Terminal, type: perl hyphen c comments dot pl and press Enter.
04:13 No syntax error.
04:15 So let us execute it, perl comments dot pl
04:21 It will show the same output as before. Count is 1.
04:27 It does not print the sentence “count variable is used for counting purpose”.
04:32 This is because we commented the portion using equal to head and equal to cut.
04:40 You can either use =head =cut or =begin =end.
04:48 These are not the special keywords used by Perl.
04:52 Please note, there should not be any leading or trailing space(s) before = to (equal to sign) and after the head, cut, begin or end word.
05:02 Open the Terminal once again.
05:05 And Type - gedit commentsExample dot pl space & and press Enter.
05:15 Type the following commands as shown on the screen.
05:19 Here, I am declaring two variables firstNum and secondNum and I am assigning some values to them.
05:28 Then I have commented this portion here.
05:32 Now I added these two numbers and assign the value to a third variable named addition.
05:39 Next, I want to print the value using print command.
05:44 Save the file and execute the Perl script on the Terminal.
05:49 On terminal, type: perl hyphen c commentsExample dot pl, press Enter.
05:57 There is no syntax error.
05:59 So, execute the script by typing
06:01 perl commentsExample dot pl press Enter.
06:07 It will show the following output. Addition is 30.
06:12 This brings us to the end of this tutorial.
06:16 Here we learnt to add comments in Perl.
06:19 Write a perl script to find square of a number.
06:23 Explain the functionality of the code written using single line comment & multiline Comment.
06:30 Watch the video available at the following link.
06:34 It summarizes the Spoken Tutorial project.
06:37 If you do not have good bandwidth, you can download and watch it.
06:42 The Spoken Tutorial Project Team:
06:44 Conducts workshops using spoken tutorials.
06:48 Gives certificates to those who pass an online test.
06:51 For more details, please write to contact at spoken hyphen tutorial dot org.
06:58 Spoken Tutorial Project is a part of the Talk to a Teacher project.
07:03 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
07:11 More information on this mission is available at the following link.
07:15 Hope you enjoyed this Perl tutorial. This is Amol Brahmankar, signing off.

Thanks for joining.

Contributors and Content Editors

Gaurav, Madhurig, PoojaMoolya, Sandhya.np14, Sneha

Retrieved from "https://script.spoken-tutorial.org/index.php?title=PERL/C2/Comments-in-Perl/English-timed&oldid=21837"