函数指针的使用

#include <iostream>

using namespace std;

int add(int a, int b)
{
    return a + b;
}

int sub(int a, int b)
{
    return a - b;
}

int jug(int a, int b)
{
    if(a >= 0) return a;
    else if(b == 0)
        return a;
    else
        return a/b;
}

int useFunc(int (*fp)(int, int), int a, int b)
{
    int Int1;
    Int1 = (*fp) (a, b);
    return Int1;
}
int main()
{
    int a = 1, b = 2, c = 3, d = 4, e = -1;
    cout<<useFunc(add, a, b)<<endl;
    cout<<useFunc(sub, a, b)<<endl;
    cout<<useFunc(jug, a, b)<<endl;
    return 0;
}