Variable Parameter Lists - C Function

C examples for Function:Variable Length Argument

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Introduction

In the following function accepts a variable number of arguments that are summed up and returned to the caller.

Demo Code

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

int sum(int num, ...) {
  va_list args; /* variable argument list */
  int sum = 0, i = 0;

  va_start(args, num); /* initialize argument list */

  for (i = 0; i < num; i++) /* loop through arguments */
    sum += va_arg(args, int); /* get next argument */

  va_end(args); /* free memory */
  return sum;/*  w  w  w  .j  a  v  a 2s .  com*/
}

int main(void) {
  printf("Sum of 1+2+3 = %d", sum(3,1,2,3)); /* 6 */
}

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