8.12.cpp

这是C++的一部分练习程序!对初学者有一定的帮助作用。

#include <iostream.h>
#include <math.h>
class Point
{
  public:
	Point(double i,double j)
	{  x=i;y=j;  }
	void Print()
	{  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()
{
	double d1=3,d2=4,d3=6,d4=8;
	Point p1(d1,d2),p2(d3,d4);
	p1.Print();
	p2.Print();
	double d=Distance(p1,p2);
	cout<<"Distance="<<d<<endl;
}