5. C++ struct constructors

• Constructors provide support for multiple ways of object creation and initialization.

• Constructor is a special member function.

• Every declaration of an object results in the calling of a constructor.

• How are constructors defined?

  
  struct Rectangle {
      int width;  // member variable
      int height; // member variable
  
      // C++ constructors
      Rectangle()
      {
          width = 1;
          height = 1;
      }
  
      Rectangle( int width_  )
      {
          width = width_;
          height = width_ ;
      }
  
      Rectangle( int width_ , int height_ )
      {
          width = width_;
          height = height_;
      }
      // ...
  };