test8.txt

思路很清晰的c++课件。例子很简明

class Rectangle{
private:
   int x1,y1,x2,y2;
public:
   Rectangle(int px1,int py1,int px2,int py2)
   {
      x1=px1;  y1=py1;
      x2=px2;  y2=py2;
   }
   int Area()
   {
      return (x2-x1)*(y2-y1);
   }
};