C++类经典例题
定义一个圆，判断点和圆的位置关系，要求用类来实现
在同一个文件中实现
#include
using namespace std;
class point
{
private:int x;int y;public:void setx(int a){x=a;}int getx(){return x;}void sety(int b){y=b;}int gety(){return y;}
};class circle
{
private:int r;point center;
public:void setr(int R){r=R;}int getr(){return r;}void setcenter(point Center){center=Center;}point getcenter(){return center;}};void isincircle(circle &c,point &p)
{int d=
(c.getcenter().getx()-p.getx())*(c.getcenter().getx()-p.getx())+
(c.getcenter().gety()-p.gety())*(c.getcenter().gety()-p.gety());int di=c.getr()*c.getr();if(d==di){cout<<"("<di){cout<<"("< 运行结果：
在不同文件中实现
main.cpp
#include
#include
#include"point.h"
#include"circle.h"
using namespace std;void isincircle(circle &c,point &p)
{int d=
(c.getcenter().getx()-p.getx())*(c.getcenter().getx()-p.getx())+
(c.getcenter().gety()-p.gety())*(c.getcenter().gety()-p.gety());int di=c.getr()*c.getr();if(d==di){cout<<"("<di){cout<<"("< point.h
#ifndef POINT_H_INCLUDED
#define POINT_H_INCLUDEDclass point
{
private:int x;int y;public:void setx(int a);int getx();void sety(int b);int gety();
};#endif // POINT_H_INCLUDED
point.cpp
#include
#include"point.h"
#include
using namespace std;void point::setx(int a){x=a;}int point::getx(){return x;}void point::sety(int b){y=b;}int point::gety(){return y;}
circle.h
#ifndef CIRCLE_H_INCLUDED
#define CIRCLE_H_INCLUDEDclass circle
{
private:int r;point center;
public:void setr(int R);int getr();void setcenter(point Center);point getcenter();};#endif // CIRCLE_H_INCLUDED
circle.cpp
#include
#include
#include"point.h"
#include"circle.h"
using namespace std;
void circle::setr(int R){r=R;}int circle::getr(){return r;}void circle::setcenter(point Center){center=Center;}point circle::getcenter(){return center;}
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