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关系运算符重载的作用：可以让两个自定义类型对象进行对比操作。

代码实现关系运算符的重载：

#include <iostream>using namespace std;class Person
{// friend const Person operator+(const Person &L, const Person &R);
private:int a;int b;
public://无参构造函数Person(){}//有参构造函数Person(int a, int b):a(a),b(b){}//成员函数实现 > 号运算符重载bool operator > (const Person &R){if(a > R.a && b > R.b){return true;}elsereturn false;}//成员函数实现 >= 号运算符重载bool operator >= (const Person &R){if(a >= R.a && b >= R.b){return true;}elsereturn false;}//成员函数实现 < 号运算符重载bool operator < (const Person &R){if(a < R.a && b < R.b){return true;}elsereturn false;}//成员函数实现 <= 号运算符重载bool operator <= (const Person &R){if(a <= R.a && b <= R.b){return true;}elsereturn false;}//成员函数实现 == 号运算符重载bool operator == (const Person &R){if(a == R.a && b == R.b){return true;}elsereturn false;}//成员函数实现 != 号运算符重载bool operator != (const Person &R){if(a != R.a && b != R.b){return true;}elsereturn false;}
};int main()
{Person p1(10,10);Person p2(10,10);if(p1 > p2){cout << "p1 > p2" << endl;}else if(p1 >= p2){cout << "p1 >= p2" << endl;}else if(p1 < p2){cout << "p1 < p2" << endl;}else if(p1 <= p2){cout << "p1 <= p2" << endl;}else if(p1 == p2){cout << "p1 == p2" << endl;}else if(p1 != p2){cout << "p1 == p2" << endl;}else{cout << "false" << endl;}return 0;
}