Difference between revisions of "PERL/C2/Blocks-in-Perl/Gujarati"

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(Created page with "{| border=1 |'''Time''' |'''Narration''' |- | 00:01 |Welcome to the spoken tutorial on ''' BLOCKS''' in Perl. |- | 00:06 | In this tutorial, we will learn about the variou...")
 
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|Welcome to the spoken tutorial on ''' BLOCKS''' in Perl.
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| પર્લમા ''' BLOCKS''' પરનાં સ્પોકન ટ્યુટોરીયલમાં સ્વાગત છે
  
 
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| 00:06
 
| 00:06
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| In this tutorial, we will learn about the various ''' BLOCKS''' available in '''Perl'''
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| આ ટ્યુટોરીયલમાં આપણે પર્લમાં ઉપલબ્ધ વિવિધ બોલ્ક્સ વિશે શીખીશું;
  
 
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|00:13
 
|00:13
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|I am using ''' Ubuntu Linux 12.04''' operating system and ''' Perl 5.14.2'''
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| અહીહું વાપરી રહ્યી છું ઉબુન્ટુ લીનક્સ 12.04 ઓપરેટીંગ સીસ્ટમ અને પર્લ Perl 5.14.2 .
 
   
 
   
 
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|00:21
 
|00:21
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| I will also be using the ''' gedit''' Text Editor.  
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| હું gedit ટેક્સ્ટ એડીટર  પણ વાપરીશ.
 
   
 
   
 
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|00:26
 
|00:26
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|You can use any text editor of your choice.  
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|તમે તમારા પસંદનું કોઈપણ ટેક્સ્ટ એડીટર વાપરી શકો છો.  
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|-
 
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|00:31
 
|00:31
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|As a pre-requisite, you should have basic knowledge of '''Variables, Comments''' in ''' Perl '''
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| પૂર્વ જરૂરી રીતે તમને પર્લમા  '''Variables, Comments''' વિષે સામાન્ય જાણકારી હોવી જોઈએ.
  
 
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| 00:38
 
| 00:38
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| Knowledge of ''' Data structures''' in '''PERL''' will be an added advantage.  
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| પર્લમા ડેટા સ્ટ્રક્ચરની  જાણકારી હોવી વધુ ફાયદા કારક છે.
  
 
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| 00:44
 
| 00:44
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|Please go through the relevant spoken tutorials on the ''' spoken tutorial ''' website.  
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|સ્પોકન ટ્યુટોરીયલ વેબસાઈટ પર સંદર્ભિત સ્પોકન ટ્યુટોરીયલોનો સંદર્ભ લો.  
  
 
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| 00:50
 
| 00:50
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|''' Perl''' provides 5 special '''blocks.'''
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| પર્લ  '''5'''   વિશિષ્ઠ બોલ્ક્સ પ્રદાન કરે છે.
  
 
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|00:53
 
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|These '''blocks''' get executed at various stages of a '''Perl''' program.  
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| આ બોલ્ક્સ પર્લ પ્રોગ્રામના વિવિધ તબક્કામાં  એક્ઝીક્યુટ થાય છે.
 
   
 
   
 
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|00:59
 
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|These blocks are:  
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|બોક્લ્સ છે:
 
   
 
   
 
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| Let us start with understanding the ''' BEGIN''' block.  
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| ચાલો ''' BEGIN'''  બોક્લને સમજવા થી શરુઆત કરીએ.
 
   
 
   
 
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|01:10
 
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|''' BEGIN''' block get executed at the time of compilation.  
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| કમ્પાઇલેશન કરતી વખતે  ''' BEGIN''' બ્લોક એક્ઝીક્યુટ થાય છે.
  
 
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|01:15
 
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|So, any code written inside this block gets executed first during compilation.  
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| તો, આ કોઇપણ કોડ જે  બોલ્કમાં લખેલ તે કમ્પાઇલેશન કરતી વખતે  પ્રથમ એક્ઝીક્યુટ થાય છે.
 
   
 
   
 
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|01:22
 
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|We can have several ''' BEGIN ''' blocks inside a ''' Perl''' script.
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|આપણી પાસે પર્લ સ્ક્રીપ્ટમા અનેક  '''BEGIN ''' બોલ્કસ છે.  
  
 
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| These blocks will get executed in the order of declaration.  
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| આ બોલ્ક્સ ડીકલેરેશન ના ક્રમમાં એક્ઝીક્યુટ થશે.
 
   
 
   
 
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|That is in the ''' First define First execute ''' pattern
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| આ ''' First define First execute ''' પેટર્ન છે.
  
 
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|The syntax for ''' BEGIN block''' is as follows
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| ''' BEGIN block''' માટે સિન્ટેક્સ આપ્યા પ્રમાણે છે.
 
   
 
   
 
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| '''BEGIN''' in capital letters space open curly bracket
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|કેપિટલ અક્ષરોમા '''BEGIN''' સ્પેસ ખુલ્લો છગડીયો કૌંસ
  
 
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| Press ''' Enter.'''  
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| ''' Enter.''' દબાઓ.
 
   
 
   
 
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|Piece of code to be executed at the time of compilation
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| કમ્પાઇલેશન કરતી વખતે એક્ઝીક્યુટ કરવા માટે નો કોડ.
 
    
 
    
 
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| Press '''Enter '''
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| '''Enter ''' દબાઓ.
  
 
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|01:52
 
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|Close curly bracket
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| બંદ ખુલ્લો છગડીયો કૌંસ
 
   
 
   
 
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|01:55
 
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|Now, let us look at an example of '''BEGIN''' blocks.  
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|ચાલો હવે 'BEGIN''' બ્લોકસ ઉદાહરણ જોઈએ.
 
   
 
   
 
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|01:59
 
|01:59
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|Open the Terminal and type
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|ટર્મિનલ ખોલો અને ટાઈપ કરો.
  
 
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|-

Revision as of 13:06, 17 October 2014

Time Narration
00:01 પર્લમા BLOCKS પરનાં સ્પોકન ટ્યુટોરીયલમાં સ્વાગત છે
00:06 આ ટ્યુટોરીયલમાં આપણે પર્લમાં ઉપલબ્ધ વિવિધ બોલ્ક્સ વિશે શીખીશું;
00:13 અહીહું વાપરી રહ્યી છું ઉબુન્ટુ લીનક્સ 12.04 ઓપરેટીંગ સીસ્ટમ અને પર્લ Perl 5.14.2 .
00:21 હું gedit ટેક્સ્ટ એડીટર પણ વાપરીશ.
00:26 તમે તમારા પસંદનું કોઈપણ ટેક્સ્ટ એડીટર વાપરી શકો છો.
00:31 પૂર્વ જરૂરી રીતે તમને પર્લમા Variables, Comments વિષે સામાન્ય જાણકારી હોવી જોઈએ.
00:38 પર્લમા ડેટા સ્ટ્રક્ચરની જાણકારી હોવી વધુ ફાયદા કારક છે.
00:44 સ્પોકન ટ્યુટોરીયલ વેબસાઈટ પર સંદર્ભિત સ્પોકન ટ્યુટોરીયલોનો સંદર્ભ લો.
00:50 પર્લ 5 વિશિષ્ઠ બોલ્ક્સ પ્રદાન કરે છે.
00:53 આ બોલ્ક્સ પર્લ પ્રોગ્રામના વિવિધ તબક્કામાં એક્ઝીક્યુટ થાય છે.
00:59 બોક્લ્સ છે:
01:01 BEGIN
01:02 END
01:03 UNITCHECK
01:04 CHECK.
01:05 INIT
01:06 ચાલો BEGIN બોક્લને સમજવા થી શરુઆત કરીએ.
01:10 કમ્પાઇલેશન કરતી વખતે BEGIN બ્લોક એક્ઝીક્યુટ થાય છે.
01:15 તો, આ કોઇપણ કોડ જે બોલ્કમાં લખેલ તે કમ્પાઇલેશન કરતી વખતે પ્રથમ એક્ઝીક્યુટ થાય છે.
01:22 આપણી પાસે પર્લ સ્ક્રીપ્ટમા અનેક BEGIN બોલ્કસ છે.
01:26 આ બોલ્ક્સ ડીકલેરેશન ના ક્રમમાં એક્ઝીક્યુટ થશે.
01:31 આ First define First execute પેટર્ન છે.
01:35 BEGIN block માટે સિન્ટેક્સ આપ્યા પ્રમાણે છે.
01:40 કેપિટલ અક્ષરોમા BEGIN સ્પેસ ખુલ્લો છગડીયો કૌંસ
01:45 Enter. દબાઓ.
01:47 કમ્પાઇલેશન કરતી વખતે એક્ઝીક્યુટ કરવા માટે નો કોડ.
01:51 Enter દબાઓ.
01:52 બંદ ખુલ્લો છગડીયો કૌંસ
01:55 ચાલો હવે 'BEGIN બ્લોકસ ઉદાહરણ જોઈએ.
01:59 ટર્મિનલ ખોલો અને ટાઈપ કરો.
02:02 gedit beginBlock dot pl space ampersand
02:08 and press Enter.
02:10 This will open the beginBlock dot pl file in gedit.
02:15 Type the following piece of code as displayed on the screen.
02:20 Let us look at what I have written inside the script.
02:24 Here, we have printed some text before and after BEGIN blocks.
02:31 Similarly, I have written one print statement in each BEGIN block.
02:37 Please note, I have not given the semicolon after the BEGIN blocks.
02:42 Putting a semicolon, will result in a syntax error, on execution of the program.
02:49 Now, press Ctrl+s to save the file.
02:53 Then switch to terminal and execute the script by typing,
02:58 perl beginBlock dot pl
03:01 and press Enter.
03:04 You will get the output as displayed on the terminal.
03:09 Notice that The line written inside the first BEGIN block gets printed first and
03:16 The first print statement in the script actually gets printed after the BEGIN block statements.
03:25 BEGIN blocks gets executed in the order of their declaration.
03:31 From this example, it is evident that:
03:34 The code written inside the BEGIN blocks gets executed first.
03:40 This is irrespective of the location of the BEGIN block inside PERL script.
03:46 BEGIN blocks always get executed in the First In First Out manner.
03:52 So one of the use of this block is to include files inside a Perl script, before actual execution starts.
04:01 Now, let us understand the END block
04:04 END block get executed at the end of PERL program
04:09 Code written inside this block gets executed after PERL has finished executing the program.
04:17 We can have several END blocks inside a Perl script.
04:21 These blocks will get executed in reverse order of declaration
04:26 That is, in Last define First execute pattern.
04:30 The syntax for END block is as follows
04:35 END in capital letters open curly bracket
04:39 Press Enter
04:40 Piece of code to be executed at the end of the PERL script
04:45 Press Enter
04:46 Close curly bracket
04:49 Now let us look at an example of END blocks.
04:53 Open the Terminal and type
04:56 gedit endBlock dot pl space ampersand
05:00 and press Enter
05:03 This will open the endBlock dot pl file in gedit.
05:08 Type the following piece of code as displayed on the screen.
05:13 Let us look at what I have written inside this script.
05:17 Here we have printed some text before and after END blocks.
05:23 Similarly, we have written one print statement in each END block.
05:29 Please note, I have not given the semicolon after the END block.
05:34 If we give the semicolon, there will be a syntax error on compilation.
05:41 Now, press Ctrl+s to save the file.
05:45 Then switch to terminal and execute the script by typing,
05:50 perl endBlock dot pl
05:53 and press Enter.
05:55 You will get the output as displayed on the terminal.
06:00 Notice that : The line written inside the END block is printed last.
06:06 The last print statement in the script actually gets printed before the END block statements and
06:13 END blocks gets executed in the reverse order of their declaration.
06:20 From the example, it is evident that
06:23 The code written inside the END blocks get executed at the end.
06:29 This is irrespective of the location of the END block inside the PERL script and
06:36 END blocks gets executed in the Last In First Out manner.
06:41 So, one use of END block is to destroy objects created in the program, before exiting.
06:49 Similarly, PERL has UNITCHECK, CHECK and INIT blocks.
06:55 These blocks are used rarely by developers and are a bit difficult to understand.
07:02 So, I will be just briefing you about these blocks.
07:06 UNITCHECK, CHECK and INIT blocks are useful-
07:10 to catch the transition between compilation and execution phase of the main program and
07:18 to perform some checks or initialisation, after compilation and before execution
07:24 UNITCHECK and CHECK blocks runs in Last in First out manner
07:31 whereas INIT block runs in First In First Out manner.
07:37 The syntax for UNITCHECK block is as follows
07:41 UNITCHECK in capital letters space open curly bracket
07:46 Press Enter
07:48 Piece of code to be executed
07:50 Press Enter
07:52 Close curly bracket
07:54 The syntax for CHECK block is as follows
07:58 CHECK in capital letters space open curly bracket
08:03 Press Enter
08:04 Piece of code to be executed
08:07 Press Enter
08:08 Close curly bracket
08:11 The syntax for INIT block is as follows
08:15 INIT in capital letters space open curly bracket
08:20 Press Enter
08:21 Piece of code to be initialised
08:24 Press Enter
08:26 Close curly bracket
08:28 For better understanding, I recommend that you experiment with these blocks in your Perl scripts.
08:36 Let us summarize.
08:37 In this tutorial, we have learnt -
08:40 BEGIN and END blocks in detail and
08:44 Introduction to UNITCHECK, CHECK and INIT blocks
08:48 using sample programs
08:52 Here is assignment for you -
08:54 Type the below code inside a PERL script;
08:58 Execute the script and observe the output.
09:02 Watch the video available at the following link
09:06 It summaries the Spoken Tutorial project
09:09 If you do not have good bandwidth, you can download and watch it
09:14 The Spoken Tutorial Project Team Conducts workshops using spoken tutorials
09:20 Gives certificates to those who pass an online test
09:24 For more details, please write to contact at spoken hyphen tutorial dot org
09:32 Spoken Tutorial Project is a part of the Talk to a Teacher project
09:37 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
09:45 More information on this Mission is available at spoken hyphen tutorial dot org slash NMEICT hyphen Intro
09:57 Hope you enjoyed this Perl tutorial.
10:00 This is Amol signing off.
10:02 Thanks for joining.

Contributors and Content Editors

Jyotisolanki, PoojaMoolya

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