Variadic function example

variadic_function.c

/*
  EXAMPLE FROM THE GNU C LIBRARY
  http://www.gnu.org/software/libc/manual/html_node/Variadic-Example.html#Variadic-Example
*/

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

int add_em_up (int count,...){
  va_list ap;
  int i, sum;

  va_start (ap, count);         /* Initialize the argument list. */

  sum = 0;
  for (i = 0; i < count; i++)
    sum += va_arg (ap, int);    /* Get the next argument value. */

  va_end (ap);                  /* Clean up. */
  return sum;
}

int main (void){
  /* This call prints 16. */
  printf ("%d\n", add_em_up (3, 5, 5, 6));

  /* This call prints 55. */
  printf ("%d\n", add_em_up (10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10));

  return 0;
}