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

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{| border=1
 
{| border=1
−
!  <center>'''Visual Cue'''</center>
+
!  '''Time'''
−
!  <center>'''Narration'''</center>
+
!  '''Narration'''
 
|-
 
|-
−
|00.00  
+
|00:00  
−
|  Welcome to the spoken tutorial on Comments in '''Perl'''.  
+
|  Welcome to the spoken tutorial on '''Comments in Perl'''.  
  
 
|-
 
|-
−
| 00.05
+
| 00:05
 
|  In this tutorial, we will learn about
 
|  In this tutorial, we will learn about
  
 
|-
 
|-
−
|00.08
+
|00:08
−
|Comments in '''Perl'''
+
|comments in '''Perl'''.
  
 
|-
 
|-
−
|00.10
+
|00:10
−
|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 '''
  
 
|-
 
|-
−
|00.18
+
|00:18
−
|that is, '''Perl''' revision 5 version 14 and subversion 2
+
|that is, '''Perl''' revision 5 version 14 and subversion 2.
−
 
+
  
 
|-
 
|-
−
|00.23
+
|00:23
 
|I will also be using the '''gedit Text Editor'''.  
 
|I will also be using the '''gedit Text Editor'''.  
  
 
|-
 
|-
−
|00.27
+
|00:27
 
|You can use any text editor of your choice.
 
|You can use any text editor of your choice.
−
 
  
 
|-
 
|-
−
|00.31
+
|00:31
−
|You should have Basic knowledge of Compiling, Executing and Variables in Perl  
+
|You should have basic knowledge of compiling, executing and variables in Perl.
  
 
|-
 
|-
−
|00.37
+
|00:37
−
|If not, please go through the relevant spoken tutorials on the spoken tutorial website  
+
|If not, please go through the relevant spoken tutorials on the spoken tutorial website.
  
 
|-
 
|-
−
| 00.43
+
| 00:43
 
|Commenting a piece of code in '''Perl''' can be done in two ways:  
 
|Commenting a piece of code in '''Perl''' can be done in two ways:  
  
 
|-
 
|-
−
| 00.47
+
| 00:47
−
|'''Single Line'''  
+
|'''Single Line''' , ''' Multi-Line'''.
−
 
+
 
|-
 
|-
−
| 00.48
+
|00:49
−
| ''' Multi Line'''
+
−
|-
+
−
|00.49
+
 
|This type of comment is used when user wants to comment a single line of code or  
 
|This type of comment is used when user wants to comment a single line of code or  
−
 
  
 
|-
 
|-
−
|00.55
+
|00:55
−
| to add one liner text to explain the functionality of a piece of code
+
| to add one liner text to explain the functionality of a piece of code.
  
 
|-
 
|-
−
|01.01
+
|01:01
−
|This type of comment starts with the symbol ''' # (hash) '''.
+
|This type of comment starts with the symbol '''# (hash)'''.
  
 
|-
 
|-
−
| 01.05
+
| 01:05
 
|Here is a demo. Let us open a new file in the Text Editor.
 
|Here is a demo. Let us open a new file in the Text Editor.
  
 
|-
 
|-
−
| 01.11
+
| 01:11
 
| Open the '''Terminal''' and type - '''gedit comments dot pl space &'''
 
| Open the '''Terminal''' and type - '''gedit comments dot pl space &'''
  
 
|-
 
|-
−
| 01.19
+
| 01:19
−
|Once again, reminding you that the '''ampersand''' is used to free the '''command prompt''' in the '''terminal'''. And press enter
+
|Once again reminding you that the ampersand is used to free the '''command prompt''' in the '''terminal''', now press '''Enter'''.
  
 
|-
 
|-
−
|01.27
+
|01:27
 
|Now type the following commands.
 
|Now type the following commands.
  
 
|-
 
|-
−
|01.29
+
|01:29
−
|'''hash Declaring count variable''' 'press '''Enter'''
+
|'''hash Declaring count variable''' press '''Enter'''.
  
 
|-
 
|-
−
|01.37
+
|01:37
−
|'''dollar count space equal to space 1 semicolon''' '''press enter'''
+
|'''dollar count space equal to space 1 semicolon''' press '''Enter'''.
  
 
|-
 
|-
−
|01.45
+
|01:45
−
|'''print space double quotes Count is dollar count slash n double quote complete semicolon space hash prints Count is 1'''
+
|'''print space double quotes Count is dollar count slash n''' double quotes complete '''semicolon space hash Prints Count is 1'''
  
 
|-
 
|-
−
|02.03
+
|02:03
−
| Now Save this file by pressing ctlr S  and execute the '''Perl''' script.
+
| Now save this file by pressing '''Ctrl S''' and execute the '''Perl''' script.
  
 
|-
 
|-
−
| 02.08
+
| 02:08
−
| Switch to the '''Terminal''', and type '''perl hyphen c comments dot pl''' and press '''Enter.'''
+
| Switch to the '''Terminal''' and type '''perl hyphen c comments dot pl''' and press '''Enter.'''
  
 
|-
 
|-
−
|02.18
+
|02:18
−
|This tells us that there is no syntax error
+
|This tells us that there is no syntax error.
  
 
|-
 
|-
−
| 02.21
+
| 02:21
−
|Now type '''perl comments dot pl''' and press '''Enter.'''
+
|Now type: '''perl comments dot pl''' and press '''Enter.'''
  
 
|-
 
|-
−
|02.28
+
|02:28
 
|  It will show the following output - '''Count is 1'''
 
|  It will show the following output - '''Count is 1'''
  
 
|-
 
|-
−
| 02.33
+
| 02:33
 
|Let us switch back to '''gedit'''.  
 
|Let us switch back to '''gedit'''.  
  
 
|-
 
|-
−
| 02.36
+
| 02:36
−
|In '''gedit''', go to the first line and press enter.
+
|In '''gedit''', go to the first line and press '''Enter'''.
  
 
|-
 
|-
−
|02.40
+
|02:40
 
|Go back to the first line and type the following command.
 
|Go back to the first line and type the following command.
  
 
|-
 
|-
−
| 02.44
+
| 02:44
 
|'''Hash exclamation mark slash usr slash bin slash perl'''
 
|'''Hash exclamation mark slash usr slash bin slash perl'''
−
 
  
 
|-
 
|-
−
| 02.52
+
| 02:52
−
|This line in '''Perl''' is called as a '''shebang''' '''line''' and is the first line in a '''Perl '''program.
+
|This line in '''Perl''' is called as '''shebang line''' and is the first line in a '''Perl '''program.
  
 
|-
 
|-
−
|02.59
+
|02:59
 
|It tells where to find the '''Perl Interpreter'''.
 
|It tells where to find the '''Perl Interpreter'''.
  
 
|-
 
|-
−
|03.03
+
|03:03
−
|'''Note:''' Though this line starts with hash symbol, it will not be considered as a single line comment by '''Perl'''.
+
|Note: Though this line starts with hash symbol, it will not be considered as a single line comment by '''Perl'''.
  
 
|-
 
|-
−
|03.11
+
|03:11
−
|Now let us look at multiline comments
+
|Now let us look at multiline comments.
  
 
|-
 
|-
−
| 03.13
+
| 03:13
−
|'''Multi Line''' This type of comment is used  
+
|'''Multi Line:''' This type of comment is used  
  
 
|-
 
|-
−
|03.17
+
|03:17
−
|when user wants to comment a piece of code or  to add description/usage of piece of code
+
|when user wants to comment a piece of code or  to add description/usage of piece of code.
  
 
|-
 
|-
−
|03.25
+
|03:25
−
|This type of comment starts with the symbol '''equal to head''' and ends with '''equal to cut'''
+
|This type of comment starts with the symbol '''equal to head''' and ends with '''equal to cut'''.
  
 
|-
 
|-
−
| 03.33
+
| 03:33
−
|Lets switch back to '''gedit''' and type the following in the '''comments dot pl '''file  
+
|Let's switch back to '''gedit''' and type the following in the '''comments dot pl '''file.
  
 
|-
 
|-
−
|03.39
+
|03:39
−
|at the end of file type '''equal to head''', press '''Enter'''
+
|At the end of file, type: '''equal to head''', press '''Enter'''.
  
 
|-
 
|-
−
|03.45
+
|03:45
−
|'''print space double quote count variable is   used for counting purpose double quote complete''' '''press enter'''
+
|'''print space double quote count variable is used for counting purpose'''  double quote complete press '''Enter'''.
  
 
|-
 
|-
−
|03.59
+
|03:59
 
|'''equal to cut'''
 
|'''equal to cut'''
  
 
|-
 
|-
−
| 04.01
+
| 04:01
 
| Save the file, close it and execute the '''Perl''' script.
 
| Save the file, close it and execute the '''Perl''' script.
  
 
|-
 
|-
−
| 04.05
+
| 04:05
−
| On the '''Terminal''', type '''perl hyphen c comments dot pl''' and press '''Enter'''.
+
| On the '''Terminal''', type: '''perl hyphen c comments dot pl''' and press '''Enter'''.
  
 
|-
 
|-
−
|04.13
+
|04:13
−
|No syntax error
+
|No syntax error.
  
 
|-
 
|-
−
| 04.15
+
| 04:15
−
| so let us execute it '''perl comments dot pl'''  
+
| So let us execute it, '''perl comments dot pl'''  
  
 
|-
 
|-
−
| 04.21
+
| 04:21
−
|  It will show the same output as before. '''Count is 1'''
+
|  It will show the same output as before. '''Count is 1'''.
  
 
|-
 
|-
−
|04.27
+
|04:27
−
|  It does not print the sentence '''“count variable is be used for counting purpose”'''
+
|  It does not print the sentence “count variable is used for counting purpose”.
  
 
|-
 
|-
−
|04.32
+
|04:32
−
| This is because we commented the portion using '''equal to head''' and '''equal to cut'''
+
| This is because we commented the portion using '''equal to head''' and '''equal to cut'''.
  
 
|-
 
|-
−
|04.40
+
|04:40
 
|  You can either use  '''=head =cut''' or '''=begin =end.'''
 
|  You can either use  '''=head =cut''' or '''=begin =end.'''
  
 
|-
 
|-
−
|04.48
+
|04:48
 
|These are not the special keywords used by '''Perl'''.
 
|These are not the special keywords used by '''Perl'''.
  
 
|-
 
|-
−
| 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 ''''=' ''' (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'''.
  
 
|-
 
|-
−
| 05.15
+
|05:15
−
| Type the following commands as shown on the screen.
+
|Type the following commands as shown on the screen.
  
 
|-
 
|-
−
|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.
  
 
|-
 
|-
−
|05.28
+
|05:28
 
|Then I have commented this portion here.
 
|Then I have commented this portion here.
  
 
|-
 
|-
−
|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.
  
 
|-
 
|-
−
|05.44
+
|05:44
 
| Save the file and execute the '''Perl''' script on the '''Terminal'''.
 
| Save the file and execute the '''Perl''' script on the '''Terminal'''.
  
 
|-
 
|-
−
|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'''.
  
 
|-
 
|-
−
| 06.12
+
| 06:12
 
| This brings us to the end of this tutorial.
 
| This brings us to the end of this tutorial.
  
 
|-
 
|-
−
|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.
  
 
|}
 
|}

Latest revision as of 15:03, 10 March 2017

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 , 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 '=' (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

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