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

Title of script: Command Line Arguments

Author: Ashwini Patil

Keywords: Video tutorial, Command Line Arguments, main()

Visual Cue	Narration
Display Slide	Hello and welcome to the spoken tutorial on Command Line Arguments.
Display Slide	In this tutorial, -we will learn about main function with arguments with an exampleWhat does this line mean Correct the sentence.
Display Slide System Requirements	For this tutorial I am using Ubuntu Linux 12.04 OS and gcc Compiler version 4.6.1 on Ubuntu
Display Slide Prerequisites spoken-tutorial.org	To follow this tutorial you should be familiar with C tutorials. If not, for relevant tutorials please visit spoken hyphen tutorial dot org.
Show the pointer to	Let us start with our program. I have a code file. I will open it. Filename is main-with-args.c
	Let me explain the program.
#include <stdio.h> #include <stdlib.h>	These are the header files. stdio.h defines core input and output functions. stdlib.h header file defines, Numeric conversion function. Pseudo-random numbers. Generation function. Memory allocation. Process control functions.
int main(int argc, char **argv)	This is our main function. Inside this we have passed two arguments. int argc, char **argv
int main(int argc, char **argv)	“argc” refers to the number of command line arguments passed to the program. This includes the actual name of the program.
	Argv contains actual arguments. Starting from index 0. Index 0 is the name of the program. Index 1 will be the first argument passed to the program. Index 2 will be the second argument passed to the program. And so on.
printf("argc is %d\n",argc);	This statement will display the total number of arguments passed to the program.
[highlight] printf("argv is %s\n",argv[1]);	This will display the 1st argument passed to the program. 1 represents the argument at index 1.
[highlight] while(argc--)	While condition will decrement the number of arguments.
[highlight again!!] printf("arguments are %s\n", *argv++);	This statement will print all the arguments passed to the program.
return 0;	At the end we have return 0 statement.
Press Ctrl+Alt+T	Let us open the terminal by pressing Ctrl+Alt+T keys.
Compile Type: gcc main-with-args.c -o args	Type: gcc main-with-args.c -o args Press Enter
Execute	Type: ./args Press Enter
Point to the output on the Terminal	You can see the output as: Total number of arguments are 1 The first argument is (null) arguments are ./args
	Command line arguments are given during execution. Total number of arguments are 1 as the zeroth argument is the executable filename itself. The first argument is (null) as we have not passed any argument to the program. Arguments are only one ie. ./args
Highlight: Type: ./arg.sh Sunday Monday Tuesday	Now let us execute again Type at the terminal: ./args Sunday Monday Tuesday
(change in your program also)	We see the output as: Total number of arguments are 4 The first argument is Sunday Argument is ./args Week days start with capital letters you can type them as I correctedReply to Madhuri (17/07/2014, 12:05): "..." Ok Argument is Sunday Argument is Monday Argument is Tuesday
	Let me explain the output.
Output:	Total number of arguments are 4 as ./args, Sunday, Monday,Tuesday. The first argument is Sunday The zeroth argument always gives “executable filename” Sunday is assigned to first argument . Monday is assigned to second argument. Tuesday is assigned to third argument This brings us to the end of this tutorial. Let us summarize.
Display slide Summary	In this tutorial we learnt, Command line arguments argc argv Slide is not as the scriptReply to Madhuri (18/07/2014, 11:04): "..." It is same.
Assignment	As an assignment, Execute the program with different arguments.
Display Slide	Watch the video available at the link shown below It summarises the Spoken Tutorial project If you do not have good bandwidth, you can download and watch it
Display Slide Spoken Tutorial Workshops	The Spoken Tutorial Project Team Conducts workshops using spoken tutorials Gives certificates to those who pass an online test For more details, please write to contact@spoken-tutorial.org
Display Slide Acknowledgement	Spoken Tutorial Project is a part of the Talk to a Teacher project It is supported by the National Mission on Education through ICT, MHRD, Government of India More information on this Mission is available at: http://spoken-tutorial.org\NMEICT-Intro
	This is Ashwini Patil from IIT Bombay signning off. Thank you for joining.

Contributors and Content Editors

Ashwini, Nancyvarkey