proj8_04.cpp

C++程序设计教程的全部源代码 包含与教程同步的PPT 方便学习

#include "iostream.h"
#include "math.h"
class Point
{
public:
	Point(double i , double j)
	{
		x = i;
		y = j;
	}
	void Getxy()
	{
		cout << "(" << x << "," << y << ")" << endl;
	}
	friend double Distance(Point a,Point b);
private:
	double x , y;
};
double Distance(Point a , Point b)
{
	double dx = a.x - b.x;
	double dy = a.y - b.y;
	return sqrt(dx * dx + dy * dy );
}
void main()
{
	Point p1(3.0,4.0) , p2(6.0,8.0);
	p1.Getxy();
	p2.Getxy();
	double d = Distance(p1,p2);
	cout << "Distance:" << d << endl;
}