#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() {
	}

	//----在此處新增關係運算符  >、<、>=、<=、==、!=  的過載原型宣告
	bool operator <(MyCircle &c)
	{
		if (radius_ < c.radius_)
			return true;
		else
			return false;
	}

	bool operator >(MyCircle &c)
	{
		if (radius_ > c.radius_)
			return true;
		else
			return false;
	}

	bool operator >=(MyCircle &c)
	{
		if (radius_ >= c.radius_)
			return true;
		else
			return false;
	}

	bool operator <=(MyCircle &c)
	{
		if (radius_ <= c.radius_)
			return true;
		else
			return false;
	}

	bool operator ==(MyCircle &c)
	{
		if (radius_ == c.radius_)
			return true;
		else
			return false;
	}

	bool operator !=(MyCircle &c)
	{
		if (radius_ != c.radius_)
			return true;
		else
			return false;
	}


};

//----在此處新增關係運算符的過載定義

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;
}
 

過載函式的命名方式為

型別 + operator + 運算子名字 （相當於函式名），然後右邊是引數型別，右結合原則