PTA 类和对象——6-1 Point类的运算

Posted 2021-05-29 猛男Banana君

定义Point类，有坐标x,y两个私有成员变量;对Point类重载“+”（相加）、“-”（相减）和“==”（相等）运算符，实现对坐标的改变，要求用友元函数和成员函数两种方法实现。对Point类重载<<运算符，以使得代码 Point p; cout<<p<<endl;可以输出该点对象的坐标。

函数接口定义：

实现Point类。

裁判测试程序样例：

/* 请在这里填写答案 */

int main(int argc, char const *argv[])
{
    Point p1(2,3);
    cout<<p1<<endl;
    Point p2(4,5);
    cout<<p2<<endl;
    Point p3 = p1+p2;    
    cout<<p3<<endl;
    p3 = p2-p1;
    cout<<p3<<endl;
    p1 += p2;
    cout<<p1<<endl;
    cout<<(p1==p2)<<endl;
    return 0;
}

#include<bits/stdc++.h>
using namespace std;

//友元函数实现 
class Point
{
	int x,y;
public:
	Point(int xx=0, int yy=0):x(xx),y(yy)  {}        //构造函数 
	friend Point operator+(Point &c1, Point &c2);
	friend Point operator-(Point &c1, Point &c2);
    friend Point operator+=(Point &c1, Point &c2);
	friend bool operator==(Point &c1, Point &c2);        //要用bool类型，因为要进行判断 
	friend ostream &operator<<(ostream &out, Point &c); 
};

Point operator+(Point &c1, Point &c2)
{
	return Point(c1.x+c2.x, c1.y+c2.y);
}

Point operator-(Point &c1, Point &c2)
{
	return Point(c1.x-c2.x, c1.y-c2.y);
}

Point operator+=(Point &c1, Point &c2)
{
	return Point(c1.x+=c2.x, c1.y+=c2.y);
}

bool operator==(Point &c1, Point &c2)
{
	if(c1.x==c2.x && c1.y==c2.y)  return 1;
	else  return 0;
}
	
ostream &operator<<(ostream &out, Point &c)            //重载<<运算符 
{
	out<<c.x<<","<<c.y;
	return out;
}