Passing a pointer of a function to another function : Function Pointer « Function « C Tutorial

1. C Tutorial
2. Function
3. Function Pointer

/*
Beginning C: From Novice to Professional, Fourth Edition

By Ivor Horton
ISBN: 1-59059-735-4
640 pp.
Published: Oct 2006
*/


#include <stdio.h>

int any_function(int(*pfun)(int, int), int x, int y){
  return pfun(x, y);
}

int sum(int x, int y){
  return x + y;
}

int product(int x, int y){
  return x * y;
}

int difference(int x, int y){
  return x - y;
}

int main(void){
  int a = 10; 
  int b = 5;  
  int result = 0; 
  int (*pf)(int, int) = sum;          /* Pointer to sum function */

  result = any_function(pf, a, b);
  printf("\nresult = %d", result );

  result = any_function(product,a, b);
  printf("\nresult = %d", result );

  printf("\nresult = %d\n", any_function(difference, a, b));
  return 0;
}

result = 15
     result = 50
     result = 5