Difference between revisions of "PERL/C2/Conditional-statements/English-timed"

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|-
 
|-
 
| 00:01
 
| 00:01
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|Welcome to the spoken tutorial on if and if-else conditional statements in Perl.
+
|Welcome to the spoken tutorial on '''if and if-else conditional statements''' in '''Perl'''.
 
   
 
   
 
|-
 
|-
 
| 00:07
 
| 00:07
−
| In this tutorial, we will learn about;
+
| In this tutorial, we will learn about:
  
 
|-
 
|-
 
|00:09
 
|00:09
−
|'''if ''' statement and  
+
|* '''if ''' statement and  
  
 
|-
 
|-
 
|00:11
 
|00:11
−
|''' if-else''' statement in Perl  
+
|* ''' if-else''' statement in Perl.
 
   
 
   
 
|-
 
|-
 
|00:12
 
|00:12
−
| I am using '''Ubuntu Linux12.04''' operating system and '''Perl 5.14.2'''
+
| I am using '''Ubuntu Linux 12.04''' operating system and '''Perl 5.14.2'''.
 
   
 
   
 
|-
 
|-
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|-
 
|-
 
| 00:28
 
| 00:28
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| You should have basic knowledge of '''Variables '''and''' Comments '''in''' Perl.'''
+
| You should have basic knowledge of variables and '''comments''' in''' Perl.'''
 
   
 
   
 
|-
 
|-
 
|00:33
 
|00:33
−
|Knowledge of '''for''', '''foreach''' , '''while and  do-while '''loops in '''Perl''' will be an added advantage.
+
|Knowledge of '''for''', '''foreach''' , '''while''' and  '''do-while '''loops in '''Perl''' will be an added advantage.
  
 
|-
 
|-
 
|00:40
 
|00:40
−
|Please go through the relevant spoken tutorials on the spoken tutorial website.  
+
|Please go through the relevant spoken tutorials on the '''spoken tutorial''' website.  
 
   
 
   
 
|-
 
|-
 
| 00:45
 
| 00:45
−
| Perl provides the following conditional statements -
+
| Perl provides the following conditional statements:
 
   
 
   
 
|-
 
|-
 
|00:49
 
|00:49
−
|'''if'''
+
|* '''if'''
 
   
 
   
 
|-
 
|-
 
|00:50
 
|00:50
−
|'''if-else '''
+
|* '''if-else '''
 
   
 
   
 
|-
 
|-
 
|00:51
 
|00:51
−
|'''if-elsif-else''' and  
+
|* '''if-elsif-else''' and  
 
   
 
   
 
|-
 
|-
 
|00:53
 
|00:53
−
|'''switch '''
+
|* '''switch '''.
 
   
 
   
 
|-
 
|-
 
|00:54
 
|00:54
−
|In this tutorial, we'll cover '''if '''and '''If-else''' statements  
+
|In this tutorial, we will cover '''if '''and '''if-else''' statements.
 
   
 
   
 
|-
 
|-
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|-
 
|-
 
|01:07
 
|01:07
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|The syntax of '''if''' conditional statement is as follows  
+
|The syntax of '''if''' conditional statement is as follows:
 
   
 
   
 
|-
 
|-
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|-
 
|-
 
|05:43
 
|05:43
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|the code within the '''if''' block will not get execute
+
|the code within the '''if''' block will not get executed.
 
   
 
   
 
|-
 
|-
 
|05:47
 
|05:47
−
|instead the code within the else block will get execute.
+
|Instead, the code within the '''else''' block will get executed.
 
   
 
   
 
|-
 
|-
 
|05:52
 
|05:52
−
|Now press ''' Ctrl+S''' to save the file.  
+
|Now press ''' Ctrl+S''' to '''save''' the file.  
 
   
 
   
 
|-
 
|-
 
|  05:56
 
|  05:56
−
| Now switch to terminal.
+
| Now switch to terminal
 
   
 
   
 
|-
 
|-
 
|05:59
 
|05:59
−
|and type '''perl hyphen c conditionalBlocks dot pl''' to check for any compilation or syntax error
+
|and type: '''perl hyphen c conditionalBlocks dot pl''' to check for any compilation or syntax error.
 
   
 
   
 
|-
 
|-
 
|  06:11
 
|  06:11
−
|  now, press '''Enter'''
+
|  Now, press '''Enter'''.
  
 
|-
 
|-
 
|  06:13
 
|  06:13
−
| The following line will be displayed on the terminal  
+
| The following line will be displayed on the terminal:
 
   
 
   
 
|-
 
|-
 
| 06:17
 
| 06:17
−
|  '''conditionalBlocks.pl syntax OK '''
+
|  "conditionalBlocks.pl syntax OK"
  
 
|-
 
|-
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|-
 
|-
 
|06:27
 
|06:27
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|Type '''perl conditionalBlocks dot pl '''
+
|Type: '''perl conditionalBlocks dot pl '''
  
 
|-
 
|-
 
|  06:33
 
|  06:33
−
| and press '''Enter'''
+
| and press '''Enter'''.
  
 
|-
 
|-
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|-
 
|-
 
|06:39
 
|06:39
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|'''I am inside else statement'''
+
|"I am inside else statement".
 
   
 
   
 
|-
 
|-
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|-
 
|-
 
| 06:46
 
| 06:46
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| In this tutorial, we have learnt -
+
| In this tutorial, we have learnt:
 
   
 
   
 
|-
 
|-
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|-
 
|-
 
| 06:53
 
| 06:53
−
|   using sample programs.  
+
| using sample programs.  
  
 
|-
 
|-
 
|  06:55
 
|  06:55
−
| Here is assignment for you -  
+
| Here is an assignment for you:  
 
   
 
   
 
|-
 
|-
 
|  06:57
 
|  06:57
−
| Print ''' “It is an open source language” '''
+
| Print “It is an open source language”
  
 
|-
 
|-
 
|07:01
 
|07:01
−
| when the variable declared has value ''' 'Perl' '''
+
| when the variable declared has value 'Perl'  
  
 
|-
 
|-
 
|07:04
 
|07:04
−
|otherwise print ''' “It's a proprietary language” '''
+
|otherwise, print “It's a proprietary language”.
 
   
 
   
 
|-
 
|-
 
|07:08
 
|07:08
−
|Watch the video available at the following link  
+
|Watch the video available at the following link.
  
 
|-
 
|-
 
|07:11
 
|07:11
−
|It summaries the Spoken Tutorial project
+
|It summaries the Spoken Tutorial project.
 
   
 
   
 
|-
 
|-
 
|07:15
 
|07:15
−
|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.
 
   
 
   
 
|-
 
|-
 
| 07:20
 
| 07:20
−
|  The Spoken Tutorial Project Team  
+
|  The Spoken Tutorial project Team:
  
 
|-
 
|-
 
| 07:22
 
| 07:22
−
| Conducts workshops using spoken tutorials
+
| Conducts workshops using spoken tutorials.
 
   
 
   
 
|-
 
|-
 
|07:26
 
|07:26
−
|Gives certificates to those who pass an online  test
+
|Gives certificates to those who pass an online  test.
 
   
 
   
 
|-
 
|-
 
|07:31
 
|07:31
−
|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.
 
   
 
   
 
|-
 
|-
 
| 07:37
 
| 07:37
−
|  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.
 
   
 
   
 
|-
 
|-
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|-
 
|-
 
|07:50
 
|07:50
−
|More information on this Mission is available at spoken hyphen tutorial dot org slash NMEICT hyphen Intro
+
|More information on this mission is available at spoken hyphen tutorial dot org slash NMEICT hyphen Intro.
 
   
 
   
 
|-
 
|-
 
| 08:00
 
| 08:00
−
| Hope you enjoyed this Perl tutorial.  
+
| Hope you enjoyed this '''Perl''' tutorial.  
 
   
 
   
 
|-
 
|-
 
|08:04
 
|08:04
−
|This is Amol Brahmankar signing off.
+
|This is Amol Brahmankar, signing off.
 
    
 
    
 
|-
 
|-

Revision as of 09:03, 8 May 2015

Time Narration
00:01 Welcome to the spoken tutorial on if and if-else conditional statements in Perl.
00:07 In this tutorial, we will learn about:
00:09 * if statement and
00:11 * if-else statement in Perl.
00:12 I am using Ubuntu Linux 12.04 operating system and Perl 5.14.2.
00:20 I will also be using the gedit Text Editor.
00:24 You can use any text editor of your choice.
00:28 You should have basic knowledge of variables and comments in Perl.
00:33 Knowledge of for, foreach , while and do-while loops in Perl will be an added advantage.
00:40 Please go through the relevant spoken tutorials on the spoken tutorial website.
00:45 Perl provides the following conditional statements:
00:49 * if
00:50 * if-else
00:51 * if-elsif-else and
00:53 * switch .
00:54 In this tutorial, we will cover if and if-else statements.
00:59 if statement in Perl can be used
01:01 to execute a piece of code only when a specified condition is satisfied.
01:07 The syntax of if conditional statement is as follows:
01:11 if space open bracket condition close bracket space Open curly bracket
01:19 Enter
01:20 Piece of code semicolon, to be executed when the condition is true
01:25 Enter, Close curly bracket
01:29 The code inside the if statement will be executed only when the condition is true.
01:36 Now let us look at an example of if statement.
01:40 Open the Terminal and type
01:43 gedit conditionalBlocks dot pl space &(ampersand )
01:49 and press Enter
01:52 This will open the conditionalBlocks.pl file in gedit.
01:57 Type the following piece of code as displayed on the screen.
02:02 Here we have specified a condition for if which checks the value of variable count.
02:09 Note the equal to equal to sign here. This is the comparison operator.
02:15 The condition $count equal to equal to 5 is checked against the value of variable count.
02:23 When it is equal to 5, the code within the if block will get executed.
02:28 Now, press ctrl+s to save the file.
02:32 Then switch to the terminal.
02:36 Make sure that you are in the directory in which you have saved your file.
02:41 Type the following to check for any compilation or syntax error -
02:46 perl hyphen c conditionalBlocks dot pl
02:53 and press Enter.
02:55 The following line will be displayed on the terminal window
02:59 conditionalBlocks.pl syntax OK
03:04 As there is no compilation or syntax error, we will execute the Perl script by typing -
03:10 perl conditionalBlocks dot pl
03:14 and press Enter
03:16 The following output will be shown on terminal.
03:19 I am inside if statement
03:23 Switch back to gedit
03:26 Alternately, we can write the above if statement as-
03:31 print space double quotes I am inside if statement slash n close double quotes space if open bracket dollar count space equal to equal to space 5 close bracket semicolon.
03:57 Now, let us look at if-else statement.
04:01 This statement is used when user wants to execute
04:06 one piece of code when the condition is true and
04:09 another piece of code when the condition is false
04:13 The syntax for if-else condition is as follows -
04:17 if space open bracket condition close bracket space open curly bracket Press Enter.
04:27 piece of code semicolon
04:29 to be executed when if condition is true,
04:32 Press Enter
04:34 close curly bracket space else space open curly bracket Enter
04:41 another piece of code semicolon
04:43 to be executed when if condition is false
04:47 Press Enter close curly bracket
04:51 Now again, go to the conditionalBlocks.pl file which we have already created in gedit.
04:58 Assign 4 to count variable then at the end of the if block type space
05:07 else
05:09 space open curly bracket press Enter
05:14 print space double quotes I am inside else statement slash n close double quotes semicolon
05:30 Press Enter and close curly bracket.
05:34 Here, 4 is assigned to variable $count.
05:38 As the value of count variable does not match 5,
05:43 the code within the if block will not get executed.
05:47 Instead, the code within the else block will get executed.
05:52 Now press Ctrl+S to save the file.
05:56 Now switch to terminal
05:59 and type: perl hyphen c conditionalBlocks dot pl to check for any compilation or syntax error.
06:11 Now, press Enter.
06:13 The following line will be displayed on the terminal:
06:17 "conditionalBlocks.pl syntax OK"
06:20 As there is no compilation or syntax error, we will now execute the Perl script.
06:27 Type: perl conditionalBlocks dot pl
06:33 and press Enter.
06:35 The following output will be shown on terminal.
06:39 "I am inside else statement".
06:44 Let us summarize.
06:46 In this tutorial, we have learnt:
06:49 if and
06:50 if-else conditional statements in Perl
06:53 using sample programs.
06:55 Here is an assignment for you:
06:57 Print “It is an open source language”
07:01 when the variable declared has value 'Perl'
07:04 otherwise, print “It's a proprietary language”.
07:08 Watch the video available at the following link.
07:11 It summaries the Spoken Tutorial project.
07:15 If you do not have good bandwidth, you can download and watch it.
07:20 The Spoken Tutorial project Team:
07:22 Conducts workshops using spoken tutorials.
07:26 Gives certificates to those who pass an online test.
07:31 For more details, please write to contact at spoken hyphen tutorial dot org.
07:37 "Spoken Tutorial" project is a part of the "Talk to a Teacher" project.
07:42 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
07:50 More information on this mission is available at spoken hyphen tutorial dot org slash NMEICT hyphen Intro.
08:00 Hope you enjoyed this Perl tutorial.
08:04 This is Amol Brahmankar, signing off.
08:06 Thanks for joining.

Contributors and Content Editors

Gaurav, PoojaMoolya, Sandhya.np14

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