Automatic Default Constructor

If we don’t provide any custom constructors, the C++ compiler provides an automatic default constructor for our class for free.

The automatic default constructor will only initialize all member variables to their default values.

Custom default constructor

The simplest constructor we can provide is a custom default constructor that specifies the state of the object when the object is constructed. We define one by creating:

• A member function with the same name of the class
• The function takes zero parameters
• The function does not have a return type

Cube.h

Cube has no return type!

Cube.cpp

main.cpp

Custom (non-default) Constructors

We can also specify custom, non-default constructors that require client code to supply arguments

Cube::Cube(double length)
// one-argument ctor specifying initial length

Custom Copy Constructor

A custom copy constructor is: