说明

此处为MyCircle类重载了一系列运算符，按照半径进行比较，用以演示关系运算符重载用法。

示例代码

#include <iostream>
#include <string>
#include <sstream>
using namespace std;

class MyShape {
protected:
    int R_, G_, B_;

    string colorToString() {
        stringstream ss;
        ss << R_ << " " << G_ << " " << B_;
        return ss.str();
    }
public:
    void setColor(int R, int G, int B) {
        R_ = R; G_ = G, B_ = B;
    }
    int getR() {
        return R_;
    }
    int getG() {
        return G_;
    }
    int getB() {
        return B_;
    }
    virtual void Draw() = 0;
    MyShape() {
        R_ = 255; G_ = 255, B_ = 255;
    }
};

class MyCircle : public MyShape {
private:
    int x_, y_, radius_;

public:
    MyCircle(int x, int y, int radius) {
        x_ = x;
        y_ = y;
        radius_ = radius;
    }

    MyCircle() {
        x_ = y_ = 200;
        radius_ = 100;
    }

    MyCircle(MyCircle& aCircle) {
        x_ = aCircle.x_;
        y_ = aCircle.y_;
        radius_ = aCircle.radius_;
        R_ = aCircle.getR();
        G_ = aCircle.getG();
        B_ = aCircle.getB();
    }
    void setCenter(int x, int y) {
        x_ = x;
        y_ = y;
    }

    void setRadius(int radius) {
        radius_ = radius;
    }

    void Draw() {
    }
    bool operator > (const MyCircle c2) const;
    bool operator < (const MyCircle c2) const;
    bool operator >=(const MyCircle c2)const;
    bool operator <=(const MyCircle c2)const;
    bool operator ==(const MyCircle c2)const;
    bool operator !=(const MyCircle c2)const;
    //----在此处添加关系运算符  >、<、>=、<=、==、!=  的重载原型声明
};
bool MyCircle::operator<(const MyCircle c2)const {
    return radius_ < c2.radius_;
}
bool MyCircle::operator>(const MyCircle c2)const {
    return radius_ > c2.radius_;
}
bool MyCircle::operator>=(const MyCircle c2)const {
    return radius_ >= c2.radius_;
}
bool MyCircle::operator<=(const MyCircle c2)const {
    return radius_ <= c2.radius_;
}
bool MyCircle::operator==(const MyCircle c2)const {
    return radius_ == c2.radius_;
}
bool MyCircle::operator!=(const MyCircle c2)const {
    return radius_ != c2.radius_;
}
//----在此处添加关系运算符的重载定义

int main() {
    int r1, r2, r3 = 0;
    cin >> r1 >> r2 >> r3;
    MyCircle c1, c2, c3;
    c1.setRadius(r1);
    c2.setRadius(r2);
    c3.setRadius(r3);

    cout << (c1 > c2) << endl;
    cout << (c1 < c2) << endl;
    cout << (c2 >= c3) << endl;
    cout << (c2 <= c3) << endl;
    cout << (c1 == c3) << endl;
    cout << (c1 != c3) << endl;
    return 0;
}