test11.txt

思路很清晰的c++课件。例子很简明

class Point{
protected:
   int x,y;
public:
   Point(int a,int b){ x=a;y=b; }
};
class Rectangle:private Point{
   int height,width;
public:
   Rectangle(int x0,int y0,int h,int w)
   {
      height=h;
      width=w;
   }
   double Area()
   {
      return height*width;
   }
};