面向对象——案例练习（4）判断点是否在圆的内部

在一个文件里进行实现：

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>

using namespace std;

//点类
class Point
{
public:
    void setXY(int x, int y)
    {
        m_x = x;
        m_y = y;
    }
    int getX()
    {
        return m_x;
    }
    int getY()
    {
        return m_y;
    }
private:
    int m_x;
    int m_y;
};

//圆类
class Circle
{
public:
    void setR(int r)
    {
        m_r = r;
    }

    void setXY(int x, int y)
    {
        m_x = x;
        m_y = y;
    }
    //判断点是否在圆内，true表示在圆内，false表示在圆外
    bool judgeCircle(Point &p)
    {
        int dd;
        dd = (p.getX() - m_x)*(p.getX() - m_x) + (p.getY() - m_y)*(p.getY() - m_y);
        if (dd > m_r*m_r)
            return false;
        else
            return true;
    }

private:
    int m_r;
    int m_x;
    int m_y;
};

int main(void)
{
    Circle c;
    c.setXY(2, 2);
    c.setR(4);

    Point p;
    p.setXY(1, 1);
    
    if (c.judgeCircle(p) == true)
    {
        cout << "在圆的内部" << endl;
    }
    else
    {
        cout << "在圆的外部" << endl;
    }

    return 0;
}

在多个文件里进行实现：

//MyPoint.h

#pragma once
class MyPoint
{
public:
    void setXY(int x, int y);
    int getY();
    int getX();
private:
    int m_x;
    int m_y;
};

//MyPoint.cpp

#include "MyPoint.h"

void MyPoint::setXY(int x, int y)
{
    m_x = x;
    m_y = y;
}
int MyPoint::getX()
{
    return m_x;
}
int MyPoint::getY()
{
    return m_y;
}

//MyCircle.h

#pragma once
#include "MyPoint.h"

class MyCircle
{
public:
    void setR(int r);
    void setXY(int x, int y);
    bool judgePoint(MyPoint &p);
private:
    int m_r;
    int m_x;
    int m_y;
};

//MyCircle.cpp

#include "MyCircle.h"
#include "MyPoint.h"

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

void MyCircle::setXY(int x, int y)
{
    m_x = x;
    m_y = y;
}


//判断点是否在圆内，true表示在圆内，false表示在圆外
bool MyCircle::judgePoint(MyPoint &p)
{
    int dd;
    dd = (p.getX() - m_x)*(p.getX() - m_x) + (p.getY() - m_y)*(p.getY() - m_y);
    if (dd > m_r*m_r)
        return false;
    else
        return true;
}

//main

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include "MyCircle.h"
#include "MyPoint.h"

using namespace std;

int main(void)
{
    MyCircle c;
    c.setXY(2, 2);
    c.setR(4);

    MyPoint p;
    p.setXY(6, 6);

    if (c.judgePoint(p) == true)
    {
        cout << "在圆的内部" << endl;
    }
    else
    {
        cout << "在圆的外部" << endl;
    }

    return 0;
}