C - Command line Argument

 C - Command line Argument

In C language, you can pass values from the command line. The arguments are placed after the program name at the time of execution. For command line arguments, set the main() function in C Language to the following, wherein argc is used to count the arguments and argv has all the arguments:

int main(int argc, char *argv[])

Display The Command Argument in C

Let us see an example: 

#include <stdio.h> int main(int argc, char *argv[] ) { printf("Displaying the command line arguments..."); printf("\nFirst argument = %s\n", argv[1]); printf("First argument = %s\n", argv[2]); printf("First argument = %s\n", argv[3]); printf("First argument = %s\n", argv[4]); return 0; }.

Output 

The output when we have set the command line arguments as A, B, C, D:

Displaying the command line arguments... First argument = A First argument = B First argument = C First argument = D

 

Count the Command Line Arguments in C

The argc in the following syntax is used to count the command line arguments in C Language

int main(int argc, char *argv[]):

Let us see an example:

#include<stdio.h> int main(int argc, char *argv[] ) { printf("Displaying the command line arguments...\n"); printf("Count of arguments = %d\n", argc); printf("\nFirst argument = %s\n", argv[1]); printf("First argument = %s\n", argv[2]); printf("Third argument = %s\n", argv[3]); printf("Fourth argument = %s\n", argv[4]); return 0; }

output

The output when we have set the command line arguments as A, B, C, D:

2 3 4 5 6 7 8 9 Displaying the command line arguments... Count of arguments = 5 First argument = A First argument = B Third argument = C Fourth argument = D.

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