#include <stdio.h>

/* two simple functions */
int add(int x, int y) {
    return x + y;
}

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


int main() {
    /* a pointer to a function - notice the weird type declaration */
    int (*fp)(int, int);

    /* point it at some function */
    int operation;
    printf("Which operation?\n1 - add\n2 - mult\n: ");
    scanf("%d", &operation);

    if (operation == 1) {
        fp = &add;
    } else {
        fp = &mult;
    }

    /* now call the function through the pointer */
    int result = fp(5, 7);
    printf("The result of your operation on 5 and 7 is: %d\n", result);

    return 0;
}