1、成员函数版本实现算术运算符的重载   全局函数版本实现算术运算符的重载

#include <iostream>

using namespace std;

class Team
{
    friend const Team operator-(const Team &t1, const Team &t2);
private:
    int a;
    int b;
public:
    Team(){}
    Team(int a, int b):a(a),b(b)
    {}

    //成员函数实现 +号 运算符重载
    const Team operator+(const Team &t) const
    {
        Team temp;
        temp.a = a + t.a;
        temp.b = b + t.b;
        return temp;
    }
    void show()
    {
        cout << "a = " << a << "  b = " << b <<endl;

    }
};
const Team operator-(const Team &t1, const Team &t2)
{
    Team temp;
    temp.a = t1.a - t2.a;
    temp.b = t1.b - t2.b;
    return temp;
}

int main()
{
    Team t1(3,6);
    Team t2(4,7);

    Team t3 = t1 + t2;
    t3.show();
    Team t4 = t2 - t1;
    t4.show();
    return 0;
}

思维导图