Another example of function pointers in C.

fn_ptr2.c

#include <stdio.h>

int add(int a, int b) {
  return a + b;
}

int main(int argc, char **argv) {
  int ret;
  int (*fn_ptr)(int a, int b);

  fn_ptr = add;
  ret = fn_ptr(3,6);

  printf("%d\n", ret);

  return 0;
}