8.4.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>
class Point1
{
  public:
	Point1(int i,int j)
	{  
		X=i;
		Y=j; 
		cout<<"Constructor calld.\n";
	}
	Point1(Point1 &rp);
	~Point1()
	{   cout<<"Destructor called.\n"; }
	int Xcood()
	{  return X;  }
	int Ycood()
	{  return Y;  }
  private:
	int X,Y;
};
Point1::Point1(Point1 &rp)
{
	X=rp.X;
	Y=rp.Y;
	cout<<"Copy Constructor called.\n";
}
Point1 &fun(Point1 Q)
{
	cout<<"ok!\n";
	int x=Q.Xcood()+5;
	int y=Q.Ycood()-5;
	Point1 R(x,y);
	Point1 &rr=R;
 	return rr;
}
void main()
{
	Point1 M(5,7),P(0,0),S(0,0);
	Point1 N(M);
	P=fun(N);
	S=M;
	cout<<"P=("<<P.Xcood()<<','<<P.Ycood()<<")\n";
	cout<<"S=("<<S.Xcood()<<','<<S.Ycood()<<")\n";
}