7. Updated constructors

• Newly added data members usually require changes in existing constructors

• Each constructor of the Rectangle struct must be updated to accommodate and initialize the ptr_name pointer:

  
  struct Rectangle {
      int width;  // member variable
      int height; // member variable
      char const* ptr_name;
  
      Rectangle()
      {
          width = 1;
          height = 1;
          ptr_name = "UNKNOWN";
      }
  
      Rectangle( char const* ptr_name_, int width_  )
      {
          width = width_;
          height = width_ ;
          ptr_name = ptr_name_;
      }
  
      Rectangle( char const* ptr_name_, int width_ , int height_ )
      {
          width = width_;
          height = height_;
          ptr_name = ptr_name_;
      }
      //...
  };//struct Rectangle