View source for Advance-C/C2/Command-line-arguments-in-C/English-timed


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! <center>Time</center>
! <center>Narration</center>

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| 00:01
|Hello and welcome to the '''spoken tutorial''' on''' Command Line Arguments.'''

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| 00:07
|In this tutorial, we will learn about  '''main''' function with '''arguments''', with an example.

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| 00:15
|For this tutorial, I am using  '''Ubuntu Operating system''' version '''11.10''' and  '''gcc Compiler''' version '''4.6.1''' on Ubuntu.

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| 00:27
| To follow this tutorial, you should be familiar with '''C''' tutorials.

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| 00:33
| If not, for relevant tutorials, please visit our website which is as shown.

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| 00:39
|Let us start with our program. I have a code file. I will open it. 

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| 00:45
|Filename is ''''main hyphen with hyphen args.c''''.

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| 00:50
|Let me explain the program.

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| 00:53
|These are the '''header''' files. '''stdio.h '''defines '''core input''' and '''output''' functions.

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| 01:01
|'''stdlib.h header file''' defines-
* '''Numeric conversion function'''
* '''Pseudo-random numbers'''
* '''Generation function'''
* '''Memory allocation'''
* '''Process control functions'''.

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|01:16
|This is our ''''main' function.''' Inside this, we have passed two '''arguments'''-
'''int argc,  char  asterisk asterisk argv''' (**argv).

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| 01:28
|'''“argc”''' refers to the number of '''command line arguments''' passed to the program.

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| 01:34
|This includes the actual name of the program.

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| 01:38
|'''argv''' contains actual '''arguments''' starting from '''index 0'''.

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| 01:44
|'''Index 0''' is the name of the program.

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| 01:48
|'''Index 1''' will be the first '''argument''' passed to the program.

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| 01:53
|'''Index 2''' will be the second '''argument''' passed to the program and so on.

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| 01:59
|This statement will display the total number of '''arguments''' passed to the program.

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| 02:05
|This will display the first argument passed to the program.

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| 02:09
|'''1''' represents the '''argument''' at '''index 1'''.

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| 02:13
|''''while' condition''' will decrement the number of '''arguments'''.

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| 02:18
|This statement will print all the '''arguments''' passed to the program.

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| 02:23
|At the end, we have''' return 0 '''statement.

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| 02:27
|Let us open the '''terminal''' by pressing '''Ctrl+Alt+T''' keys simultaneously on your keyboard.

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| 02:35
|Type:''' gcc space main hyphen with hyphen args.c space hyphen o space args'''. Press''' Enter'''.

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| 02:49
|Type:''' dot slash args'''. Press''' Enter'''.

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| 02:54
|You can see the output as:

"Total number of arguments are 1"
 
"The first argument is null"
 
"arguments are ./args" 

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| 03:06
|'''Command line arguments ''' are given during execution.

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| 03:11
|'''Total number of arguments are 1''' as the zeroth argument is the executable filename itself.

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| 03:19
|'''The first argument is (null) '''as we have not passed any argument to the program. 

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| 03:26
|'''Arguments''' are only one i.e. '''dot slash args'''.

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| 03:31
|Now let us execute again.

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| 03:34
|Press the up-arrow key '''space''' type: '''Sunday space Monday space Tuesday'''. Press '''Enter'''

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| 03:47
|Now we can see the output:
'''Total number of arguments are 4 '''

'''The first argument is Sunday '''

'''Arguments are ./args ''' '''Sunday Monday ''' and '''Tuesday '''.

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| 04:04
|Let me explain the output.

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| 04:06
|Total number of arguments are 4 as- '''./args, Sunday, Monday''' and '''Tuesday.'''

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| 04:14
|The first argument is "Sunday".

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| 04:17
|The zeroth argument always gives executable filename.

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| 04:22
|"Sunday" is assigned to first argument.

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| 04:25
|"Monday" is assigned to second argument.

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| 04:28
|"Tuesday" is assigned to third argument. 

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| 04:31
|This brings us to the end of this tutorial. Let us summarize.

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| 04:37
|In this tutorial, we learnt:
* '''Command line arguments'''
* '''argc'''
* '''argv'''.

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| 04:45
|As an assignment, execute the program with different '''arguments'''.

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| 04:51
|Watch the video available at the link shown below.

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| 04:54
|It summarizes the Spoken Tutorial project. 

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| 04:57
|If you do not have good bandwidth, you can download and watch it.

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| 05:02
|The Spoken Tutorial Project team: * Conducts workshops using spoken tutorials. 

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| 05:08
|* Gives certificates to those who pass an online test. For more details, please write to '''contact@spoken-tutorial.org'''

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| 05:18
|'''Spoken Tutorial''' Project is a part of the '''Talk to a Teacher''' project.

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| 05:22
|It is supported by the National Mission on Education through ICT, MHRD, Government of India.

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| 05:30
|More information on this mission is available at: '''http://spoken-tutorial.org\NMEICT-Intro'''.

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| 05:36
|This is Ashwini Patil from IIT Bombay, signning off.
Thank you for joining.

|}