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C program to demonstrate example of Variable Arguments

This program will demonstrate example of Variable Arguments, in this program we will create a user define function for calculating sum of N arguments, using Variable Arguments we can pass multiple arguments in the function.

Example of Variable Arguments using C program

/*C program to demonstrate example of Variable Arguments.*/

#include <stdio.h>
#include <stdarg.h>

/*find sum of numbers*/
int sum(int N, ...)
{
	int loop,sum;
	va_list va; /*for argument list*/
	
	va_start(va,N); /*init with number of arguments*/
	
	/*access arguments & calculating sum*/
	sum=0;
	for(loop=0;loop<N;loop++){
		sum+=va_arg(va,int);
	}
	
	return sum;
}

int main()
{	
	printf("Sum of 10, 20 = %d\n",sum(2,10,20));
	printf("Sum of 10, 20, 30, 40 = %d\n",sum(4,10,20,30,30));
	printf("Sum of 10, 20, 30, 40, 50, 60 = %d\n",sum(6,10,20,30,30,40,50));
	
	return 0;
}

Sum of 10, 20 = 30
Sum of 10, 20, 30, 40 = 90
Sum of 10, 20, 30, 40, 50, 60 = 180