C++ Tutorial/Function/const methods

#include <iostream>
 
 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(10) {}
 
 Rectangle::~Rectangle()
 {}
 
 int main()
 {
     Rectangle* pRect =  new Rectangle;
     const Rectangle * pConstRect = new Rectangle;
     Rectangle * const pConstPtr = new Rectangle;
 
     std::cout << "pRect width: " << pRect->GetWidth() << " feet\n";
     std::cout << "pConstRect width: " << pConstRect->GetWidth() << " feet\n";
     std::cout << "pConstPtr width: " << pConstPtr->GetWidth() << " feet\n";
 
     pRect->SetWidth(10);
     pConstPtr->SetWidth(10);
 
     std::cout << "pRect width: " << pRect->GetWidth() << " feet\n";
     std::cout << "pConstRect width: " << pConstRect->GetWidth() << " feet\n";
     std::cout << "pConstPtr width: " << pConstPtr->GetWidth() << " feet\n";
     return 0;
 }