关于函数的调用

Question

#include<iostream>using namespace std;int sum(int x,int y){return x+y}int product(int x,int y){return x*y}void main(){ ————————（填一些） int a, b, result; cout << "a="; cin >> a; cout << "b="; cin >> b; pf = sum; result = pf(a, b); cout << a << "+" << b << "=" << result << endl; pf = product; result = pf(a, b); cout << a << "*" << b << "=" << result << endl;}不懂 这里的调用

Answer 1

可以了  开始我弄错了  谢谢

Answer 2

是要填写函数怎么调用的吧？