PoojaMoolya at 12:24, 28 February 2017

2017-02-28T12:24:29Z

Jyotisolanki at 06:02, 13 November 2014

2014-11-13T06:02:39Z

Jyotisolanki at 06:03, 28 October 2014

2014-10-28T06:03:31Z

Jyotisolanki at 05:02, 17 October 2014

2014-10-17T05:02:26Z

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Jyotisolanki: Created page with "{| border=1 |'''Time''' |'''Narration''' |- | 00:00 |Welcome to the spoken tutorial on ''' if-elsif-else ''' and '''switch''' conditional statements in Perl. |- | 00:07 |..."

2014-09-26T06:01:30Z

Created page with "{| border=1 |'''Time''' |'''Narration''' |- | 00:00 |Welcome to the spoken tutorial on ''' if-elsif-else ''' and '''switch''' conditional statements in Perl. |- | 00:07 |..."

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{| border=1
|'''Time'''
|'''Narration'''

|-
| 00:00
|Welcome to the spoken tutorial on ''' if-elsif-else ''' and '''switch''' conditional statements in Perl.

|-
| 00:07
| In this tutorial, we will learn about

|-
|00:10
|The ''' if-elsif-else''' statement and ''' switch''' statement in '''Perl '''

|-
|00:15
| I am using '''Ubuntu Linux12.04''' operating system and '''Perl 5.14.2'''

|-
|00:22
|I will also be using the '''gedit '''Text Editor.

|-
|00:25
|You can use any text editor of your choice.

|-
| 00:29
| You should have basic knowledge of '''Variables '''and''' Comments '''in''' Perl.'''

|-
| 00:34
|and knowledge of ''' for, foreach, while''' and '''do-while''' loops and

|-
| 00:38
| ''' if ''' and '''if-else''' statements will be an added advantage.

|-
|00:43
|Please go through the relevant spoken tutorials on the '''spoken tutorial '''website.

|-
|00:48
|''' If-elsif-else''' statement in '''Perl''' can be used

|-
| 00:52
| to test multiple conditions and

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|00:54
|When all conditions fail then it executes the default '''else''' block

|-
|00:59
|The syntax of '''if-elsif-else''' statement is as follows

|-
|01:04
|''' if space''' open bracket ''' condition''' close bracket space Open curly bracket press Enter

|-
|01:13
|piece of code to be executed when the condition is true semicolon

|-
|01:18
|Press '''Enter '''

|-
| 01:20
| Close curly bracket space '''elsif''' space open bracket ''' condition''' close bracket space open curly bracket

|-
|01:30
|Press '''Enter '''

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|01:31
|another piece of code semicolon

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|01:33
|to be executed when '''elsif condition''' is true

|-
|01:37
|Press '''Enter '''

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|01:39
|close curly bracket space ''' else''' space open curly bracket

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|01:44
| Enter

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| 01:45
|code semicolon to be executed when both the above conditions are false semicolon

|-
|01:51
|Press '''Enter '''

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|01:52
| close curly bracket

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| 01:55
| First, the ''' if ''' condition is checked and executed if the condition is true.

|-
|02:01
|If not, then the ''' else if''' condition is checked and executed if it is true.

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|02:06
|Otherwise, the code within '''else''' block is executed.

|-
|02:11
|Now let us look at an example of '''if-elsif-else''' statement.

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|02:16
|Open the Terminal and type

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|02:19
| '''gedit conditionalBlocks dot pl space ampersand'''

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|02:26
| and press '''Enter'''

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|02:28
|This will open the ''' conditionalBlocks.pl''' file in '''gedit. '''

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|02:33
|Type the following piece of code as displayed on the screen.

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| 02:38
| We have assigned the value ''' 'Perl' ''' to variable language.

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|02:44
|Note that, '''eq''' is '''string comparison''' operator.

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|02:49
| And then we have the various conditons that we want to check.

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|02:55
|Now, press ctrl+s to save the file.

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|02:58
|Then switch to terminal and execute file directly.

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| 03:02
| Type, '''perl conditionalBlocks dot pl '''

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|03:09
|Note: I am skipping the compilation step. It is not a mandatory step for executing Perl scripts.

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| 03:16
| If there is any compilation error,

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| 03:18
| execution will throw an error and will stop execution of script

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| 03:23
| Now press '''Enter.'''

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|03:25
|The output shown on the terminal is

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| 03:27
| ''' Hi, I am Perl '''

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| 03:29
| Now, let us look at our next case.

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|03:31
|Switch to '''gedit. '''

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|03:33
|Assign ''' 'Java' ''' to variable language as shown.

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| 03:37
| Press '''ctrl+s''' to save the file.

|-
|03:40
|Switch to the terminal and execute the file.

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|03:43
|Type ''' perl conditionalBlocks dot pl '''

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| 03:50
| and press '''Enter.'''

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| 03:53
| The output shown on terminal is ''' Hi, I am Java '''

|-
| 03:59
| Again let us switch back to '''gedit. '''

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| 04:03
| Now, let us assign ''' 'English' ''' to the ''' language''' variable.

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| 04:07
| Press ''' ctrl+s ''' to save the file.

|-
|04:09
|Switch to the terminal and execute the file.

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|04:13
|Type '''perl conditionalBlocks dot pl '''

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|04:18
|and press '''Enter.'''

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|04:19
|The output shown on terminal is

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|04:22
|'''I am not a computer language '''

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| 04:27
| The 3 cases imply that;

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| 04:29
| Only one ''' if block''' that satisfies the condition will be executed.

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|04:35
| otherwise the default ''' else block''' will get execute.

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|04:39
|We can have multiple ''' elsif''' conditions as per our requirement, like this.

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|04:46
|Here is an assignment for you -

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|04:48
|Write an ''' if-elsif-else''' statement to print

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|04:51
|''' “I am a Science graduate” ''' if '''stream''' is ''' science '''

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|04:55
|'''“I am a Commerce graduate” ''' if '''stream''' is '''commerce'''

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|04:59
|''' “I am an Arts graduate” ''' if ''' stream''' is neither ''' science''' or '''commerce '''

|-
|05:06
|Now let us learn about the '''switch''' statement.

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| 05:10
| Till Perl 5.8, there was no '''switch''' statement in '''Perl.'''

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| 05:14
| After that, '''Switch module''' was introduced,

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|05:18
|which provided the functionality of ''' switch''' statement.

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| 05:22
| Note: ''' Modules''' in '''Perl''' will be covered in subsequent tutorials.

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| 05:27
| The syntax of ''' switch''' is as follows:

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| 05:30
| use '''Switch''' semicolon

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| 05:32
| Press '''Enter'''

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| 05:34
| '''switch ''' space open bracket '''dollar value''' close bracket space open curly bracket

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|05:42
|Press '''Enter '''

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| 05:44
| '''case ''' space 1 space open curly bracket ''' executes when dollar value equal to 1''' close curly bracket.

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| 05:53
| Press '''Enter'''

|-
|05:55
|'''case ''' space single quote '''a ''' single quote space open curly bracket ''' executes when dollar value equal to''' single quote ''' a ''' single quote close curly bracket

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| 06:09
| Press ''' Enter '''

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| 06:10
|''' else''' space open curly bracket ''' executes when dollar value does not match any of the cases '''

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|06:18
|Close curly bracket

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|06:19
|Press '''Enter '''

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| 06:20
| close curly bracket

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| 06:22
| Let us understand '''switch''' using a sample program.

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| 06:26
| Open the Terminal and type

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|06:29
| ''' gedit sampleSwitch dot pl space ampersand'''

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|06:36
|and press '''Enter'''

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|06:38
|Now, type the sample program as shown on the screen.

|-
| 06:43
| Let us understand how the ''' switch''' statement works.

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|06:46
| The '''use Switch''' statement includes the '''Switch''' module inside the '''Perl''' code.

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|06:54
| Note: We will learn about '''use keyword''' in detail in subsequent tutorials.

|-
|07:00
| Now we'll test the different cases.

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|07:03
| We have assigned ''' 'Perl' ''' to the variable ''' $var'''

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|07:08
| The value in variable ''' $var''' is checked in the switch statement.

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|07:14
| In the first case, it matches with the case ''' 'Perl'.'''

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|07:19
| So the code written against this '''case''' will be executed.

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|07:24
| Press ''' ctrl+s''' to '''save''' the file.

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|07:27
| Now, switch to terminal and execute the script

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|07:31
| '''perl sampleSwitch.pl'''

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|07:36
| press '''Enter'''

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|07:38
| The following output is shown on the terminal

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|07:41
|''' I am Perl '''

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|07:43
| Switch back to ''' sampleSwitch.pl''' in '''gedit.'''

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|07:48
| Now, let us assign ''' 'Linux' ''' to the variable ''' $var '''

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|07:52
|Press ''' Ctrl S''' to save the file.

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|07:57
| Again, the value of variable ''' $var''' will be checked in switch.

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|08:03
| It matches with the case ''' 'Linux' '''

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|08:05
| So code written against this case will get executed.

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|08:10
| Now, switch to terminal and execute the script

|-
|08:15
| '''perl sampleSwitch.pl'''

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|08:19
| Press '''Enter'''

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|08:21
| The following output is shown on the terminal

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|08:24
| ''' I am Linux'''

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|08:26
| Switch to ''' sampleSwitch.pl''' in ''' gedit.'''

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|08:30
| Similarly, if variable ''' $var''' has value ''' 'Java' ''', then second case will be checked.

|-
|08:38
| Now, let us assign ''' 'English' ''' to the variable ''' $var'''

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|08:42
| Again, the value of variable ''' $var ''' will be checked in switch.

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|08:47
|It does not match any of the ''' case''' statements.

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|08:50
| So the ''' else ''' statement will be executed.

|-
|08:54
| Now, switch to terminal and execute the script

|-
|09:00
| ''' perl sampleSwitch.pl'''

|-
|09:07
| and Press ''' Enter'''

|-
|09:09
| The following output is shown on the terminal -

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|09:12
|''' I am not a computer language '''

|-
|09:17
| The 3 cases imply that:

|-
|09:20
| The value of the expression decides the ''' case ''' to be executed

|-
|09:25
| Only the valid ''' case''' will be executed and

|-
|09:28
| When there is no valid '''case''', then the default ''' else ''' case will be executed

|-
|09:35
| It is not mandatory to write the '''else case. '''

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|09:39
| In such a scenario,

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|09:41
| if none of the ''' cases''' match

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|09:44
| then there will be no output from the ''' switch''' statement.

|-
|09:48
| Here is another assignment for you -

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|09:50
| Re-write the previous assignment

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|09:53
| given earlier in this tutorial using ''' switch''' statement.

|-
|09:57
| Let us summarize.

|-
|09:59
| In this tutorial, we have learnt -

|-
|10:01
| ''' if-elsif-else''' statement and

|-
|10:04
| '''switch''' statement in '''Perl '''

|-
|10:05
| '''using sample programs. '''

|-
|10:08
|Watch the video available at the following link

|-
|10:12
|It summaries the Spoken Tutorial project

|-
|10:15
|If you do not have good bandwidth, you can download and watch it

|-
| 10:20
| The Spoken Tutorial Project Team Conducts workshops using spoken tutorials

|-
|10:25
|Gives certificates to those who pass an online test

|-
|10:30
|For more details, please write to contact at spoken hyphen tutorial dot org

|-
| 10:36
| Spoken Tutorial Project is a part of the Talk to a Teacher project

|-
|10:40
|It is supported by the National Mission on Education through ICT, MHRD, Government of India.

|-
|10:47
|More information on this Mission is available at spoken hyphen tutorial dot org slash NMEICT hyphen Intro

|-
| 10:58
| Hope you enjoyed this Perl tutorial.

|-
|11:00
|This is Amol signing off.

|-
|11:03
|Thanks for joining.

|}

@@ Line 105: / Line 105: @@
 |-
 | 01:51
-| '''Enter''' દબાવો
+| '''Enter''' દબાવો છગડીયો કૌંસ બંધ
-−
-|-
-| 01:52
-| છગડીયો કૌંસ બંધ
 |-
@@ Line 357: / Line 353: @@
 |-
 | 06:18
-| છગડીયો કૌંસ બંધ
+| છગડીયો કૌંસ બંધ '''Enter ''' દબાવો
-−
-|-
-| 06:19
-| '''Enter ''' દબાવો
 |-
@@ Line 589: / Line 581: @@
 |-
 | 10:04
-| '''switch''' સ્ટેટમેંટ
+| '''switch''' સ્ટેટમેંટ સેમ્પલ પ્રોગ્રામ દ્વારા સમજ્યા.
-−
-|-
-| 10:05
-| સેમ્પલ પ્રોગ્રામ દ્વારા સમજ્યા.
 |-

@@ Line 45: / Line 45: @@
 |-
 | 00:48
-| પર્લમાનાં '''If-elsif-else''' સ્ટેટમેંટનો ઉપયોગ
+|  '''If-elsif-else''' સ્ટેટમેંટનો ઉપયોગ
 |-
@@ Line 373: / Line 373: @@
 |-
 | 06:26
-| ટર્મિનલ ખોલો અને ટાઈપ કરો
+| ટર્મિનલ જાઓ અને ટાઈપ કરો
 |-
@@ Line 457: / Line 457: @@
 |-
 | 07:57
-| ફરીથી, સ્વીચમાં ''' $var''' આ વેરીએબલની વેલ્યુ તપાસવામાં આવશે.
+| ફરીથી, સ્વીચમાં ''' $var''' ના  વેરીએબલની વેલ્યુ તપાસવામાં આવશે.
 |-

@@ Line 9: / Line 9: @@
 |-
 | 00:07
-| આ ટ્યુટોરીયલમાં આપણે આપેલ વિશે શીખીશું
+| આ ટ્યુટોરીયલમાં આપણે આપેલ વિશે શીખીશું.
 |-
@@ Line 565: / Line 565: @@
 |-
 | 09:48
-| અહીં તમારી માટે બીજું એક એસાઈનમેંટ છે -
+| અહીં તમારી માટે બીજું  એસાઈનમેંટ છે -
 |-

PERL/C2/More-Conditional-statements/Gujarati - Revision history

PoojaMoolya at 12:24, 28 February 2017

Jyotisolanki at 06:02, 13 November 2014

Jyotisolanki at 06:03, 28 October 2014

Jyotisolanki at 05:02, 17 October 2014

Jyotisolanki: Created page with "{| border=1 |'''Time''' |'''Narration''' |- | 00:00 |Welcome to the spoken tutorial on ''' if-elsif-else ''' and '''switch''' conditional statements in Perl. |- | 00:07 |..."