Does Assignment Operator Call Copy Constructor?

Copy constructor is called when a new object is created from an existing object, as a copy of the existing object. Assignment operator is called when an already initialized object is assigned a new value from another existing object. In the above example (1) calls copy constructor and (2) calls assignment operator.

Does copy constructor call constructor?

Your copy constructor does not call your default constructor. This allows a constructor to leverage the initialization(s) performed by another constructor of the same class.

What does a copy assignment operator do?

A trivial copy assignment operator makes a copy of the object representation as if by std::memmove. All data types compatible with the C language (POD types) are trivially copy-assignable.