Difference between revisions of "PERL/C3/Including-files-or-modules/Gujarati"

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(Created page with "{| Border = 1 |'''Time ''' |'''Narration''' |- |00:01 |Welcome to the''' Spoken Tutorial''' on''' Including files or modules''' in a '''PERL''' program. |- |00:08 |In this t...")
 
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|Welcome to the''' Spoken Tutorial''' on''' Including files or modules''' in a '''PERL''' program.
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| '''PERL''' પ્રોગ્રામમાં ''' Including files or modules''' પરના સ્પોકન ટ્યુટોરીયલમાં તમારુ સ્વાગત છે.  
  
 
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|In this tutorial, we will learn to use:
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|આ ટ્યુટોરીયલમાં આપણે આપેલ મેથડનો ઉપયોગ કરતા શીખીશું
 
* '''do'''
 
* '''do'''
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* '''use '''and
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* '''use ''' અને
 
* '''require'''
 
* '''require'''
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'''method'''s in PERL programming.
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|For this tutorial, I am using:
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|અહી આપણે વાપરી રહ્યા છીએ.
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* '''Ubuntu Linux 12.04''' operating system
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* '''Ubuntu Linux 12.04''' ઓપરેટીંગ સીસ્ટમ
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* '''Perl 5.14.2''' and
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* '''Perl 5.14.2''' અને
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* '''gedit''' Text Editor.
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* '''gedit''' ટેક્સ્ટ એડિટર
  
 
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|You can use any '''text editor''' of your choice.
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| તમે તમારી પસંદગી અનુસાર કોઈ પણ ટેક્સ્ટ એડિટર વાપરી શકો છો.  
  
 
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| To follow this tutorial, you should have working knowledge of''' Perl''' programming.
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| આ ટ્યુટોરીયલનાં અનુસરણ માટે તમને ''' Perl''' પ્રોગ્રામિંગ ની સામાન્ય જાણકરી હોવી જોઈએ.
  
 
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|If not, then go through the relevant''' Perl''' spoken tutorials on the''' spoken tutorial''' website.
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| જો નથી, તો સંબંધિત ટ્યુટોરીયલો માટે, અમારી વેબસાઇટની મુલાકાત લો.  
  
 
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|''''do()' method''': These are simple ways to include the source code from other files into the current script file.
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|''''do()' method''':   આ વર્તમાન સ્ક્રીપ્ટ ફાઈલમાં અન્ય ફાઈલથી  સોર્સ કોડ ને સમાવેશ કરવા માટે નો સરળ માર્ગ છે.
  
 
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|00:53
 
|00:53
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|Let us understand how to use '''do() method'''.
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| ચાલો '''do() method''' ને કેવી રીતે વાપરવું તે વિશે શીખીએ.
  
 
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|Open a new file in your text editor and name it as '''datetime dot pl'''.  
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| તમારા ટેક્સ્ટમાં નવી ફાઈલ ખોલો અને તેને '''datetime dot pl''' નામ આપો.
  
 
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|In the''' datetime dot pl''' file, type the following code as displayed on the screen.
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|''' datetime dot pl''' ફાઈલમાં , સ્ક્રીન પર પ્રદશિત ની જેમ આપેલ કોડ ટાઇપ કરો.
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|01:09
 
|01:09

Revision as of 17:01, 2 February 2016

Time Narration
00:01 PERL પ્રોગ્રામમાં Including files or modules પરના સ્પોકન ટ્યુટોરીયલમાં તમારુ સ્વાગત છે.
00:08 આ ટ્યુટોરીયલમાં આપણે આપેલ મેથડનો ઉપયોગ કરતા શીખીશું
  • do
  • use અને
  • require


00:16 અહી આપણે વાપરી રહ્યા છીએ.
  • Ubuntu Linux 12.04 ઓપરેટીંગ સીસ્ટમ
  • Perl 5.14.2 અને
  • gedit ટેક્સ્ટ એડિટર
00:28 તમે તમારી પસંદગી અનુસાર કોઈ પણ ટેક્સ્ટ એડિટર વાપરી શકો છો.
00:32 આ ટ્યુટોરીયલનાં અનુસરણ માટે તમને Perl પ્રોગ્રામિંગ ની સામાન્ય જાણકરી હોવી જોઈએ.
00:37 જો નથી, તો સંબંધિત ટ્યુટોરીયલો માટે, અમારી વેબસાઇટની મુલાકાત લો.
00:44 'do()' method: આ વર્તમાન સ્ક્રીપ્ટ ફાઈલમાં અન્ય ફાઈલથી સોર્સ કોડ ને સમાવેશ કરવા માટે નો સરળ માર્ગ છે.
00:53 ચાલો do() method ને કેવી રીતે વાપરવું તે વિશે શીખીએ.
00:57 તમારા ટેક્સ્ટમાં નવી ફાઈલ ખોલો અને તેને datetime dot pl નામ આપો.
01:03 datetime dot pl ફાઈલમાં , સ્ક્રીન પર પ્રદશિત ની જેમ આપેલ કોડ ટાઇપ કરો.
01:09 From here onwards, remember to press the Enter key after every command on the terminal.
01:15 Let us understand the code now.
01:18 The current date and time is stored in a variable dollar datestring.
01:23 Here, I have a function by name "msgThanks" which returns a “Thank you” message.
01:31 Now, press Ctrl+S to save the file.
01:35 Next, let us look at another Perl program which will make use of this file datetime dot pl.
01:43 Open a new file in your text editor and name it as main dot pl.
01:49 In the main dot pl file, type the following code as displayed on the screen.
01:55 Let me explain the code now.
01:58 Here, the first line prints the welcome message.
02:03 'do()' method is called with the filename from where we want to use the code.
02:09 Current date and time is stored in the $datestring variable of datetime dot pl file.
02:16 And at the end, we call the msgThanks() function from the same file.
02:21 Now, press Ctrl+S to save the file.
02:25 Let us execute the program.
02:27 Switch back to the terminal and type: perl main dot pl and press Enter.
02:34 Observe the output on the terminal.
02:37 Next, we will learn how to use require() method and use() method in a Perl program.
02:44 These methods are used - when we have collections of subroutines that can be used in multiple Perl programs.
02:52 use() method is used only for the modules.
02:56 It is verified at the time of compilation.
02:59 There is no need to give the file extension.
03:03 require() method is used for both Perl programs and modules.
03:08 It is verified at the run time.
03:10 One needs to give the file extension.
03:14 The syntax of use() method is: use module name semicolon.
03:20 Perl modules are the files which end with '.pm' extension.
03:25 Re-usability of code is implemented through modules.
03:30 These are similar to libraries in other languages.
03:35 Now, I will show a simple program with the use method to include a module in Perl code.
03:43 Open a new file in your text editor and name it as sum dot pm.
03:49 In the sum dot pm file, type the following code as displayed on the screen.
03:55 Here, I have a simple function which will calculate the sum of a given set of numbers.
04:01 Now, press Ctrl+S to save the file.
04:05 We will write another Perl script where we’ll use this sum dot pm file.
04:11 Let me open the sample program app dot pl file which I have saved already.
04:17 In the app dot pl file, type the following code as displayed on the screen.
04:22 Let me explain the code now.
04:25 The first line shows the use method with the module name.
04:29 In our case, the module name is 'sum'.
04:33 We are passing 1, 7, 5, 4,9 as input parameters to the function total() in sum dot pm file.
04:44 Again, in the next line, we are passing 1 to 10 as input parameters to the same function.
04:52 Now, press Ctrl+S to save the file.
04:56 Let us execute the program.
04:59 Switch back to the terminal and type: perl app dot pl and press Enter.
05:06 Observe the output displayed on the terminal.
05:10 Let us see few more options in use method. Switch back to sum dot pm in the text editor.
05:18 At the beginning of the source code, add the lines "use strict" semicolon, "use warnings" semicolon.
05:27 "use strict" and "use warnings" are compiler flags that instruct Perl to behave in a stricter way.
05:35 These are used to avoid common programming mistakes.
05:39 use strict forces the user to declare all the variables used in the program.
05:45 If there are errors, use strict will abort the execution.
05:50 use warnings will only provide warnings but continue with the execution.
05:56 Assume that we forgot to declare the variable $sum as my.
06:02 Let us now see how the same program is executed.
06:06 Press Ctrl+S to save the file.
06:09 Switch back to the terminal and type: perl app dot pl.
06:15 We can see that the program is aborted without executing the result.
06:21 The first set of lines displayed on the terminal are error messages generated by “use strict”.
06:29 The last two are the abort messages.
06:32 So, this is how the use method options work.
06:36 Next, let us see a Perl program where we use the require method.
06:41 Let me open the sample program commonfunctions dot pl which I have already saved.
06:48 Type the following code as displayed on the screen in your commonfunctions dot pl file.

Let us understand the code now.

06:57 Here, we can see a collection of commonly used functions.
07:01 The first function square(), returns the square of a number.
07:06 The second function, square underscore root(), returns the square root of a given number.
07:12 Next function random underscore number(), generates a random number.
07:18 The last function random underscore range(), generates a random number between a lower range and upper range of numbers.
07:26 Note that we need the 1 semicolon at the end of the file.
07:31 This is because Perl needs the last expression in the file to return a true value.
07:37 Now, press Ctrl+S to save the file.
07:41 Next, we will write a Perl program in which we’ll call these subroutines using require method.
07:48 Let me open the sample program callprogram dot pl which I have already saved.
07:54 Type the following code as displayed on the screen in your file. Let me explain the code now.
08:02 require reads the commonfunctions dot pl file containing Perl code and compiles it.
08:09 This program gives 4 options to the user. The user has to choose one option at a time.
08:17 1: (one) is to find the square of a number.
08:20 2: Two is for square root of a number.
08:23 3: Three is for a random number in the given range. 4: Four is to quit the program.
08:29 If option 1 (one) is typed, it will ask the user to enter a number.
08:34 The value is stored in $number. The value is passed to the function square() in commonfunctions dot pl file.
08:44 The function returns the square of a number.
08:47 The print statement prints the square of a number as output.
08:52 If option 2 (two) is typed, the square root of a number is displayed as output.
08:58 The execution is followed as explained in the previous function square().
09:03 If option 3 (three) is typed, a random number is displayed as output in the given range.
09:09 Else, if option is 4 (four), the program exits. If any option other than the ones specified is given, the print statement says “Incorrect option”.
09:20 Note that in this program, we have called only three functions out of four from commonfunctions dot pl.
09:28 Now, press Ctrl+S to save the file.
09:31 Let us execute the program.
09:34 Switch back to the terminal and type: perl callprogram dot pl.
09:41 Observe the output.
09:44 I'll execute the program once again with a different option.
09:49 Type: perl callprogram dot pl.
09:53 Now, enter the option as 3.
09:56 Enter a lower range as 50.
09:59 Enter a upper range as 99.
10:02 We can see the random number is generated in the given range of numbers.
10:08 Try other options on your own.
10:11 This brings us to the end of this tutorial. Let us summarize.
10:16 In this tutorial, we learnt to use:
  • do
  • use
  • require methods in PERL programming.
10:24 Note: "use" module is recommended over "require" module, because it determines module availability at compile time.
10:33 Here is an assignment for you. Write a Perl program reminder.pl where you will write a letter to the participants.
10:41 Prompt the user to enter To and From name.
10:45 Call the subroutines from Letter dot pm using ‘use’ method.
10:50 Write the below functions in Letter dot pm file.
10:54 LetterDate() function returns the current date and time.
10:58 To() function returns the name of the participants.
11:02 From() function returns the sender's name.
11:05 Lettermsg() function returns the contents of the letter.
11:09 Thanksmsg() function returns "thanks" and "regards".
11:13 The output should be displayed as shown here.
11:20 The video at the following link summarizes the spoken tutotial project. Please download and watch it.
11:27 The Spoken Tutorial Project team:
  • conducts workshops using spoken tutorials and
  • gives certificates on passing online tests.
11:36 For more details, please write to us.
11:40 Spoken Tutorial project is funded by NMEICT, MHRD, Government of India.

More information on this mission is available at this link.

11:51 This is Nirmala Venkat from IIT Bombay, signing off. Thanks for watching.

Contributors and Content Editors

Jyotisolanki, PoojaMoolya

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