Difference between revisions of "PERL/C2/Conditional-statements/Gujarati"
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|- | |- | ||
Revision as of 11:05, 7 August 2014
| 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 Linux12.04 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'll 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 execute |
| 05:47 | instead the code within the else block will get execute. |
| 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 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. |
