C program to find the sum of two numbers using command line arguments

C Programming Language Command Line Arguments (Article) Command Line Arguments (Program)

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Program:

#include <stdio.h>

int main(int argc, char *argv[])
{
	int a,b,sum;
	if(argc!=3)
	{
		printf("please use \"prg_name value1 value2 \"\n");
		return -1;
	}
	
	a = atoi(argv[1]);
	b = atoi(argv[2]);
	sum = a+b;
	
	printf("Sum of %d, %d is: %d\n",a,b,sum);
	
	return 0;
}

Output:

First run:
sh-4.2$ ./main 10 20
Sum of 10, 20 is: 30 

Second run:
sh-4.2$ ./main 10 20 30 40
please use "prg_name value1 value2 "

Explanation:

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