Problem C: 从点到面Time Limit: 1 Sec Memory Limit: 128 MB
Submit: 4968 Solved: 2648
[Submit][Status]Description一个矩形可以由左上角和右下角的顶点而唯一确定。现在请定义两个类：Point和Rectangle。
其中Point类有x和y两个属性（均为int类型），表示二维空间内一个点的横纵坐标，并具有相应的构造函数、析构函数和拷贝构造函数。此外，还有getX()和getY()方法用以得到一个点的坐标值。
Rectangle类有leftTop和rightBottom两个属性（均为Point类的对象），表示一个矩形的左上角和右下角的两个点，并具有相应的构造函数、析构函数。此外，还有getLeftTop()、getRightBottom()方法用于获取相应的左上角点、右下角点，getArea()方法用以获取面积。
Input输入有多行。
第一行是一个正整数M，表示后面有M个测试用例。
每个测试用例占一行，包括4个正整数，分别为左上角的横坐标、纵坐标，右下角的横坐标、纵坐标。
注意：
1.请根据输出样例判断两个类中相应方法的书写方法。
2. 假定屏幕的左下角为坐标原点。
Output输出见样例。
Sample Input
1
10 10 20 0
Sample Output
A point (10, 10) is created!
A point (20, 0) is created!
A rectangle (10, 10) to (20, 0) is created!
Area: 100
Left top is (10, 10)
A point (20, 0) is copied!
A point (20, 0) is copied!
Right bottom is (20, 0)
A point (20, 0) is erased!
A point (20, 0) is erased!
A rectangle (10, 10) to (20, 0) is erased!
A point (20, 0) is erased!
A point (10, 10) is erased!
HINTAppend Codeappend.cc,
#include<iostream>
#include<cstring>
#include<iomanip>
using namespace std;
class Point{
friend class Rectangle;
private:
int x_;
int y_;
public:
// Character(){cout<<"Default constructor is called!"<<endl;}
Point(int x,int y):x_(x),y_(y){cout<<"A point ("<<x_<<", "<<y_<<") is created!"<<endl;}
Point(const Point &p){x_=p.x_;y_=p.y_;cout<<"A point ("<<x_<<", "<<y_<<") is copied!"<<endl;}
// void setCharacter(char c){c_=c;}
// int getAsciiCode(){return c_;}
// char getCharacter(){return c_;}
~Point(){cout<<"A point ("<<x_<<", "<<y_<<") is erased!"<<endl;}
int getX(){return x_;}
int getY(){return y_;}
};
class Rectangle{
friend class Point;
private:
Point lT,rB;
public:
Rectangle(int x1,int y1,int x2,int y2):lT(x1,y1),rB(x2,y2){cout<<"A rectangle ("<<lT.x_<<", "<<lT.y_<<") to ("<<rB.x_<<", "<<rB.y_<<") is created!"<<endl;}
~Rectangle(){cout<<"A rectangle ("<<lT.x_<<", "<<lT.y_<<") to ("<<rB.x_<<", "<<rB.y_<<") is erased!"<<endl;}
Point &getLeftTop(){return lT;}
Point getRightBottome(){return rB;}
double getArea(){double a;a=(rB.x_-lT.x_)*(lT.y_-rB.y_);return a;}
};
int main()
{
int cases;
int x1, y1, x2, y2;
cin>>cases;
for (int i = 0; i < cases; i++)
{
cin>>x1>>y1>>x2>>y2;
Rectangle rect(x1,y1,x2,y2);
cout<<"Area: "<<rect.getArea()<<endl;
cout<<"Left top is ("<<rect.getLeftTop().getX()<<", "<<rect.getLeftTop().getY()<<")"<<endl;
cout<<"Right bottom is ("<<rect.getRightBottome().getX()<<", "<<rect.getRightBottome().getY()<<")"<<endl;
}
return 0;
}