面向对象——案例练习（5）判断两个圆是否相交

多个文件实现：

//Mypoint.h

#pragma once

class Mypoint
{
public:
    void setXY(int x, int y);
    double disPoint(Mypoint &another);
private:
    int m_x;
    int m_y;
};

//Mypoint.cpp

#include "Mypoint.h"
#include "cmath"

void Mypoint::setXY(int x, int y)
{
    m_x = x;
    m_y = y;
}
double Mypoint::disPoint(Mypoint &another)
{
    return sqrt((m_x - another.m_x)*(m_x - another.m_x) + (m_y - another.m_y)*(m_y - another.m_y));
}

//Mycircle.h

#pragma once
#include "Mypoint.h"

class Mycircle
{
public:
    void setR(int r);
    void setXY(int x, int y);
    bool isIntersect(Mycircle &another);
private:
    int m_r;
    Mypoint p;
};

//Mycircle.cpp

#include "Mycircle.h"

void Mycircle::setR(int r)
{
    m_r = r;
}

void Mycircle::setXY(int x,int y)
{
    p.setXY(x, y);
}
bool Mycircle::isIntersect(Mycircle &another)
{
    double dis = p.disPoint(another.p);
    int rr = m_r + another.m_r;
    if (dis <= rr)
    {
        return true;
    }
    else
    {
        return false;
    }
}

//main.cpp

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include "Mycircle.h"
#include "Mypoint.h"

using namespace std;

int main(void)
{
    Mycircle c1,c2;
    int x,y,r;

    cout << "圆1的半径：" << endl;
    cin >> r;
    c1.setR(r);
    cout << "圆1的x：" << endl;
    cin >> x;
    cout << "圆1的y：" << endl;
    cin >> y;
    c1.setXY(x, y);

    cout << "圆2的半径：" << endl;
    cin >> r;
    c2.setR(r);
    cout << "圆1的x：" << endl;
    cin >> x;
    cout << "圆1的y：" << endl;
    cin >> y;
    c2.setXY(x, x);    

    if(c1.isIntersect(c2)==true)
    {
        cout << "相交" << endl;
    }
    else
    {
        cout << "不相交" << endl;
    }

    return 0;
}

一个文件实现：

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include "cmath"

using namespace std;

class Point
{
public:
    void setXY(int x, int y)
    {
        m_x = x;
        m_y = y;
    }
    double disPoint(Point &another)
    {
        return sqrt((m_x- another.m_x)*(m_x - another.m_x)+ (m_y - another.m_y)*(m_y - another.m_y));
    }
private:
    int m_x;
    int m_y;
};

class Circle
{
public:
    void setR(int r)
    {
        m_r = r;
    }
    void setXY(int x, int y)
    {
        p.setXY(x, y);
    }
    //判断圆是否与我相交
    bool isInteract(Circle &another)
    {
        int rr = m_r + another.m_r;
        double dis = p.disPoint(another.p);
        if (rr >= dis) 
            return true;
        else 
            return false;
    }
private:
    int m_r;
    Point p;
};

int main(void)
{
    Circle c1, c2;
    int x, y, r;
    cout << "圆一的半径：";
    cin >> r ;
    c1.setR(r);
    cout << "圆一的x：";
    cin >> x;
    cout << "圆一的y：";
    cin >> y;
    c1.setXY(x, y);

    cout << "圆二的半径：";
    cin >> r;
    c2.setR(r);
    cout << "圆二的x：";
    cin >> x;
    cout << "圆二的y：";
    cin >> y;
    c2.setXY(x, y);

    if (c1.isInteract(c2) == true)
        cout << "相交" << endl;
    else
        cout << "不相交" << endl;

    return 0;
}