cpoint

 #include<iostream>
 #include<math.h>
 using namespace std;
 class CPoint
 {
 public:
     int cpoint()
     {
         x = ;
         y = ;
         return ;
     }
     int cpoint(double a , double b)
     {
         x=a;
         y=b;
         return ;
     }
     double GetX()
     {
         return x;
     }
     double GetY()
     {
         return y;
     }
     int SetX(double a)
     {
         x=a;
         return ;
     }
     int SetY(double a)
     {
         y=a;
         return ;
     }
 private:
     double x,y;
 };
 class CRectangle:public CPoint
 {
 private:
     CPoint cp1,cp2;
 public:
     int crectangle()
     {
         cp1.cpoint();
         cp2.cpoint();
         return ;
     }
     int crectangle( const CPoint& c1,const CPoint& c2)
     {
         cp1 = c1;
         cp2 = c2;
         return ;
     }
     int SetLPoint( const CPoint& c1)
     {
         cp1 = c1;
         return ;
     }
     int SetRPoint( const CPoint& c2)
     {
         cp2 = c2;
         return ;
     }
     double GetPerimeter()
     {
         double X1,X2,Y1,Y2;
         X1 = cp1.GetX();
         X2 = cp2.GetX();
         Y1 = cp1.GetY();
         Y2 = cp2.GetY();
         return (fabs(X1 - X2) + fabs(Y1 - Y2)) * ;
     }
     double GetArea()
     {
         return fabs(cp1.GetX() - cp2.GetX()) * fabs(cp1.GetY() - cp2.GetY());
     }
 };
 int main()
 {
     CRectangle * a_rectagnle = new CRectangle ;
     CPoint c1 , c2 ;
     c1.cpoint(  ,  );
     c2.cpoint(  ,  );
     a_rectagnle->crectangle( c1,c2 );
     cout << "perimeter = " << a_rectagnle->GetPerimeter() << endl;
     cout << "area = " << a_rectagnle->GetArea() << endl;
     c1.cpoint(,);
     a_rectagnle->SetLPoint( c1 );
     c2.cpoint( ,  );
     a_rectagnle->SetRPoint( c2 );
     cout << "perimeter = " << a_rectagnle->GetPerimeter() << endl;
     cout << "area = " << a_rectagnle->GetArea() << endl;
     delete a_rectagnle;
     return ;
 }