接受int形参(double,,等等)返回int（...）;并且一个vector对象保存指向这些函数的指针;进行加减乘除;输出结果

#include <bits/stdc++.h> using namespace std; int f1(int a,int b) { return a+b; } int f2(int a,int b) { return a-b; } int f3(int a,int b) { return a*b; } int f4(int a,int b) { return a/b; } int main() { vector<int(*)(int,int)> v; v.push_back(f1); v.push_back(f2); v.push_back(f3); v.push_back(f4); cout << v[0](1,2) << endl; cout <<v[1](1,2) << endl; cout << v[2](1,2) << endl; cout << v[3](2,1) << endl; return 0; }