random_call.c

/*
 * This program defines two functions (excluding 'main') and makes a random call
 * to one of those.
 *
 * Just wandering if C supports this kind of 'feature'.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>

void first(void)
{
  printf("first called\n");
}

void second(void)
{
  printf("second called\n");
}

void (*funcs[])(void) = { first, second };

int main(void)
{
  unsigned r;

  srand(time(NULL));

  r = rand() % 2;

  printf("calling %p (%p, %p)\n", (void *)funcs[r], (void *)first, (void *)second);

  funcs[r]();

  return 0;
}