l6_4.cpp

《C++程序设计教程》电子教案及例题源码

#include <iostream.h>
#include <math.h>
class CPoint
{
public:
	CPoint(int x=0, int y=0)
	{
		X=x;
		Y=y;
		cout << " CPoint 构造函数被调用" << endl;
	};
	CPoint(CPoint &p);
	int GetX()
	{
		return X;
	}
	int GetY()
	{
		return Y;
	}
private:
	int X,Y;
};

CPoint::CPoint(CPoint &p)
{
	X = p.X;
	Y = p.Y;
	cout << " CPoint 拷贝构造函数被调用" << endl;
	cout << "(" << X << "," << Y << ")" << endl;
}

class CLine
{
public:
	CLine(CPoint p1, CPoint p2);
	float GetDistance();
private:
	CPoint start;
	CPoint end;
};

CLine::CLine(CPoint p1, CPoint p2): start(p1), end(p2)
{
	cout << "CLine 构造函数被调用" << endl;
}
float CLine::GetDistance()
{
	double x = double (end.GetX() - start.GetX() );
	double y = double (end.GetY() - start.GetY() );
	return (float) sqrt(x*x + y*y );
}

void main()
{
    CPoint p1(1,1), p2(4,5);
	CLine l(p1, p2);
	cout << "The distance is :";
	cout << l.GetDistance() << endl;
}