Pointer to function

#include <stdio.h>

int add(int x, int y) { return x+y; }
int minus(int x, int y) { return x-y; }
int mul(int x, int y) { return x*y; }

int operation(int x, int y, int (*fn)(int, int))
{
    return (*fn)(x, y);
}

int main()
{
    int x = 4;
    int y = 3;
    printf("add(%d, %d) = %d\n", x, y, operation(x, y, add));
    printf("minus(%d, %d) = %d\n", x, y, operation(x, y, minus));
    printf("mul(%d, %d) = %d\n", x, y, operation(x, y, mul));

    return 0;
}