类的声明与类的实现分开 点和圆

设计一个圆形类（AdvCircle），和一个点类（Point），计算点在圆内部还是圆外

即：求点和圆的关系（圆内和圆外）

point.h

#ifndef __POINT_H__#define __POINT_H__class Point{public:// 设置点的坐标void setXY(int x, int y);int getX();int getY();// 求当前的点和另一个点的距离的平方int distance(Point &p);private:int  m_x;   // x的坐标int  m_y;   // y的坐标};

point.cpp

#include "Point.h"void Point::setXY(int x, int y){m_x = x;m_y = y;}int Point::getX(){return m_x;}int Point::getY(){return m_y;}int Point::distance(Point &p){int dis = (m_x - p.getX())*(m_x - p.getX()) + (m_y - p.getY()) * (m_y - p.getY());// int dis = (m_x - p.m_x)*(m_x - p.m_x) + (m_y - p.m_y) * (m_y - p.m_y);return dis;}

circle.h

#ifndef  __CIRCLE_H__#define  __CIRCLE_H__#include "Point.h"class Circle{public:void setCircle(int r, int x, int y);bool inCircle(Point &p);private:int m_r;     // 半径Point m_rp;  // 圆心};#endif  // __CIRCLE_H__

circle.cpp

#include "Circle.h"void Circle::setCircle(int r, int x, int y){m_r = r;            // 设置半径m_rp.setXY(x, y);   // 设置圆心}bool Circle::inCircle(Point &p){if (m_rp.distance(p) <= m_r*m_r) // 点p 到 圆心的长度小于等于半径return true;elsereturn false;}

main.cpp

#include <stdio.h>#include "Circle.h"#include "Point.h"int main(){Circle c;c.setCircle(20, 20, 20);Point p;p.setXY(10,20);if (c.inCircle(p)){printf ("在圆内\n");}else{printf ("在圆外\n");}return 0;}