Advance-C/C2/Command-line-arguments-in-C/English-timed

Time	Narration
00:01	Hello and welcome to the spoken tutorial on Command Line Arguments.
00:07	In this tutorial, we will learn about main function with arguments with an example.
00:15	For this tutorial I am using Ubuntu Operating system version 11.10 and gcc Compiler version 4.6.1 on Ubuntu
00:27	To follow this tutorial, you should be familiar with C tutorials.
00:33	If not, for relevant tutorials please visit our website which is as shown.
00:39	Let us start with our program. I have a code file. I will open it.
00:45	Filename is main hyphen with hyphen args.c
00:50	Let me explain the program.
00:53	These are the header files. stdio.h defines core input and output functions.
01:01	stdlib.h header file defines- Numeric conversion function. Pseudo-random numbers. Generation function. Memory allocation. Process control functions.
01:16	This is our main function. Inside this, we have passed two arguments- int argc, char asterisk asterisk argv (**argv)
01:28	“argc” refers to the number of command line arguments passed to the program.
01:34	This includes the actual name of the program.
01:38	argv contains actual arguments starting from index 0.
01:44	Index 0 is the name of the program.
01:48	Index 1 will be the first argument passed to the program.
01:53	Index 2 will be the second argument passed to the program. And so on.
01:59	This statement will display the total number of arguments passed to the program.
02:05	This will display the first argument passed to the program.
02:09	1 represents the argument at index 1.
02:13	While condition will decrement the number of arguments.
02:18	This statement will print all the arguments passed to the program.
02:23	At the end we have return 0 statement.
02:27	Let us open the terminal by pressing Ctrl+Alt+T keys simultaneously on your keyboard.
02:35	Type: gcc space main hyphen with hyphen args.c space hyphen o space args. Press Enter
02:49	Type: dot slash args. Press Enter.
02:54	You can see the output as: Total number of arguments are 1 The first argument is null arguments are ./args
03:06	Command line arguments are given during execution.
03:11	Total number of arguments are 1 as the zeroth argument is the executable filename itself.
03:19	The first argument is (null) as we have not passed any argument to the program.
03:26	Arguments are only one ie. dot slash args
03:31	Now let us execute again
03:34	Press the uparrow key space type Sunday space Monday space Tuesday. Press Enter
03:47	Now we can see the output: Total number of arguments are 4 The first argument is Sunday Argument are ./args Sunday Monday and Tuesday .
04:04	Let me explain the output.
04:06	Total number of arguments are 4 as ./args, Sunday, Monday and Tuesday.
04:14	The first argument is Sunday
04:17	The zeroeth argument always gives executable filename.
04:22	Sunday is assigned to first argument.
04:25	Monday is assigned to second argument.
04:28	Tuesday is assigned to third argument.
04:31	This brings us to the end of this tutorial. Let us summarize.
04:37	In this tutorial we learnt, Command line arguments argc argv
04:45	As an assignment, execute the program with different arguments.
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05:36	This is Ashwini Patil from IIT Bombay signning off. Thank you for joining.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14