175: Highlights

• If you want to make a function with a class-object parameter into a member function, then define the function inside a class definition as you would an ordinary function, and eliminate the class-object parameter from the parameter list and from the member variable references.
• If a member function is large, then move the definition outside the class definition, and leave behind a function prototype in the class definition,

  return data type function name ( ); 
  

  and indicate the class to which the moved member function belongs by joining the class name to the definition via two colons:

  return data type class name::function name ( ) {...} 
  

• If you want to call a member function, then use the class-member operator, a period, to identify the class object on which the function is to work, noting the following contrasts:

  ordinary function (all arguments) 
  class-object argument.member function (other arguments)