#include <iostream>
using namespace std;

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

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

int main() {
    int (*func_ptr)(int, int) = add;
    cout << func_ptr(3, 2);
    func_ptr = sub;
    cout << func_ptr(3, 2);
    return 0;
}