const指针，通不过编译，求助

#include <iostream>
using namespace std;

class Rectangle
{
      public:
               Rectangle();
               ~Rectangle();
               //void SetLength(int length){itsLength = length;}
               //int GetLength() const { return itsLength;}
               void SetWidth(int width){ itsWidth = width;}
               int GetWidth() const { return itsWidth;}
                             
      private:
                //int itsLength;
                int itsWidth;
}
Rectangle::Rectangle()
{
      itsWidth = 5;
                      }
              //itsLength = 6;
              

Rectangle::~Rectangle()
{}
int main()
{
    Rectangle * pRect = new Rectangle;
    const Rectangle * pConstRect = new Rectangle;
    Rectangle * const pConstPtr = new Rectangle;
   
    cout << "pRect width: " << pRect->GetWidth() << "feet\n";
    cout << "pConstRect width: " << pConstRect->GetWidth() << " feet\n";
    cout << "pConstPtr width. " << pConstPtr->GetWidth() << " feet\n";
    pRect -> SetWidth(10);
    pConstRect -> SetWidth(9);
    pConstPtr -> SetWidth(10);
   
    cout << "pRect width: " << pRect->GetWidth() << "feet\n";
    cout << "pConstRect width: " << pConstRect->GetWidth() << " feet\n";
    cout << "pConstPtr width. " << pConstPtr->GetWidth() << " feet\n";
    system("pause");
     }