#ifndef __CRICLE_H__ #define __CRICLE_H__ #include "point.h" class Circle { public: //创建圆 void init(int r, int x, int y); //判断点是否在 当前圆 内 bool inCircle(Point &p); private: Point _c; int _r; }; #endif// __CRICLE_H__
点的头文件
#ifndef __POINT_H__ #define __POINT_H__ class Point { public: //创建点 void init(int x, int y); //测一个点和当前点的距离的平方 int distance(Point &p); private: int _x; int _y; }; #endif//__POINT_H__
圆的源文件
#include "circle.h" void Circle::init(int r, int x, int y) { _r = r; _c.init(x, y); } bool Circle::inCircle(Point &p) { //计算点p和 当前圆圆心c 的距离 int dis = p.distance(_c); //和半径比较 if (dis <= _r*_r) return true; else return false; }
点的源文件
#include "point.h" void Point::init(int x, int y) { _x = x; _y = y; } int Point::distance(Point &p) { int dis = (_x-p._x)*(_x-p._x) + (_y-p._y)*(_y-p._y); return dis; }
main文件
#include <iostream> #include "circle.h" #include "point.h" using namespace std; int main() { //一个点 Point p; p.init(1,2); Circle c; c.init(3, 0, 0); if (c.inCircle(p)) cout << "在圆内" << endl; else cout << "在圆外" << endl; return 0; }
