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構造函數和拷貝構造函數的實例

#include<iostream.h>

class Point
{  public:                                          //共有數據  外部接口
     Point(int xx=0,int yy=0)          //構造函數
            { 
                X=xx;
                Y=yy;
           }
      Point(Point &P);                      // 拷貝構造函數
      int GetX()
        { return X;}
      int GetY()
         { retrun Y;}
 private:
    int X, int Y;            // 私用數據
};
// 成員函數的實現

Point ::Point(Point &P)
{  X=P.X;
   Y=P.Y;
  cout<<"拷貝構造函數被調用"<<endl;
}
void fun1(Point P)
{  cout<<P.GetX()<<endl;
}
void fun2()
{  Point A(1,2)
    retrun A;

}

void main()
{  Point A(4,5);
   Point B(A);
  cout<<B.GetX()<<endl;
  fun1(B);
B=fun2();
cout<<B.GetX()<<endl;
}