2-2.cpp

用类进行图形的关系判断

#include <iostream>     
#include <cmath>   
using namespace std;
class Point                                             /*点类定义*/ 
{
    public:                                             /*外部借口，公有成员函数*/ 
        friend double Distance(Point &p,Point &q);
        Point(float xx = 0,float yy = 0)                /*构造函数*/ 
        {
            X=xx;
            Y=yy;
        }
        Point(Point &p)                                 /*拷贝构造函数*/
        {
            X=p.X;
            Y=p.Y;
        }
        float GetX() {return X;}; 
        float GetY() {return Y;};
    private:                                             /*私有数据成员*/ 
        float X,Y;
};

        
double Distance(Point &p,Point &q)   
{   
    float result;   
    return sqrt((p.X-q.X)*(p.X-q.X)+(p.Y-q.Y)*(p.Y-q.Y));   
}   

class circle
{
    private:                                             /*私有数据成员*/ 
        Point H;
        float R;
    public:                                              /*外部借口，公有成员函数*/ 
        circle (circle &);                               /*拷贝构造函数*/ 
        circle (Point h,float r);                        /*构造函数*/ 
        Point GeTH() {return H;}
        float GetR() {return R;}
    
};

circle::circle (Point h,float r):H(h)
{
    H=h;
    R=r;
}

int main()   
{   
    float px,py,qx,qy;
    float r1,r2;
    char temp;
    cout << "请输入两个点的坐标(px,py),(qx,qy):" << endl;
    cin >>px>>py>>qx>>qy;
    cout << "请输入两个圆的半径r1,r2:" << endl;
    cin >>r1>>r2;
    Point p1(px,py),p2(qx,qy);  
    circle c1(p1,r1),c2(p2,r2);
    double d= Distance (p1,p2);  
    cout << "圆心间距离是:" << d << endl; 
    cout << "半径和是:" << (r1+r2) << endl; 
    if (r1+r2<d)
        cout << "两圆相离" << endl; 
    else
        cout << "两圆相交" << endl; 
    system("pause");
    return 0;
}