类的数据封装.cpp

c++实例~ 初学基础

#include<iostream.h>
#include<math.h>

class Point
{
public:
	void set(double ix,double iy) {x=ix;y=iy;}
	void reset() {x = y = 0;}
	double getX() {return x;}
	double getY() {return y;}
	double angle() {return (180/3.1415926)*atan2(y,x);}
	double radius() {return sqrt(x*x+y*y);}
private:
	double x;
	double y;
};

void main()
{
	Point p;
	double x;
	double y;
	cout<<"Now you will input four points"<<endl;
	for(int i=1;i<5;i++ )
	{
		cout<<"Please input point "<<i<<" : "<<endl;
		cout<<"Enter x offset: ";
		cin>>x;
		cout<<"Enter y offset: ";
		cin>>y;
		
		p.set(x,y);
		cout<<"********************"<<endl;
		cout<<"angle   = "<<p.angle()<<endl;
		cout<<"radius  = "<<p.radius()<<endl;
		cout<<"x offset= "<<p.getX()<<endl;
		cout<<"Y offser= "<<p.getY()<<endl;
		cout<<"********************"<<endl;
	}
	return;
}