/*
 * ISA 563, Spring 2011
 * Copyleft by Muhammad Abdulla
 */

#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/time.h>

/*
 * func_ptr.c -- demonstrates the use of function pointers 
 */

void dog ( )
{
   printf("wuff!\n");
}

void cat ( )
{
   printf("meow!\n");
}

void unknown ( )
{
   printf("Sorry, don't know how to make a sound.\n");
}

int main (int argc, char *argv[] )
{
   char *animal; 
   void (* fp)() = NULL;

   if ( argc != 2 ) {
      fprintf(stderr, "Usage: %s some-animal\n", argv[0]);
      exit(-1);
   }

   animal = argv[1];

   if ( strcmp(animal, "dog") == 0 ) {
      fp = dog;
   } else if ( strcmp(animal, "cat") == 0 ) {
      fp = cat;
   } else {
      fp = unknown;
   }

   fp();

   return 0;
}