【C++】构建一个正方形类

#include<iostream>
#include<cmath>
using namespace std;
#define pi 3.14
class point {
	int x, y;
public:
	point() { cout << "point默认构造函数调用" << endl; }
	point(int xx, int yy):x(xx),y(yy) { cout << "point有参构造函数调用" << endl; }
	point(point& p);
	double distance(point& p);
	int getx() { return x; }
	int gety() { return y; }
};
point::point(point& p) {
	x = p.x;
	y = p.y;
	cout << "point复制构造函数调用" << endl;
}
//求两点间距离
double point::distance(point& p) {
	cout << "distance函数的调用" << endl;
	return sqrt((x - p.x) * (x - p.x) + (y - p.y) * (y - p.y));
}

  


class circle {
public:
	circle() { cout << "circle默认构造函数调用"<<endl; }
	circle(point pp, int rr);
	circle(circle& c) {
		p = c.p;
		radius = c.radius;
		cout << "circle复制构造函数调用" << endl;
	}
	int getr() { return radius; }
	double area();
	double circumference();
	void co_area(circle& c);
private:
	point p;
	int radius;
};
double circle::area(){
	cout << "circle::area函数的调用" << endl;
	return pi * radius * radius;
}
circle::circle(point pp, int rr) :p(pp), radius(rr) { 
	cout << "circle有参构造函数调用" << endl;
}
double circle::circumference() {
	cout << "circle::ciecunference函数的调用" << endl;
	return 2 * pi * radius;
}
void circle::co_area(circle &c){
	int point_p = p.distance(c.p);
	if (point_p >= radius + c.radius) {
		cout << "两个圆不相交" << endl;
	}
	else
		cout << "两个圆相交" << endl;
}



int main() {
	point p1(2, 5), p2(3,6);
	circle c1(p1, 3), c2(p2, 3);
	int d_p1_p2 = p1.distance(p2);
	cout << "p1\p2之间的距离：" << d_p1_p2 << endl;
	cout << "c1的面积：" << c1.area() <<"   c2的面积："<<c2.area()<< endl;
	cout << "c1的周长：" << c1.circumference() << "  c2的周长：" << c2.circumference() << endl;
	c1.co_area(c2);
	return 0;
}