CPP Operator Overloading & Type Conversions

Question 1

Which keyword is used to define an overloaded operator in C++?

Accepted Answer

operator

Answer

The `operator` keyword followed by the operator symbol (e.g., `operator+`) defines an overloaded operator in C++.

Question 2

Which of the following operators CANNOT be overloaded in C++?

Accepted Answer

operator::

Answer

The scope resolution operator (::), dot operator (.), sizeof, typeid, and ternary (?:) cannot be overloaded.

Question 3

What is the conventional return type for the copy assignment operator (operator=)?

Accepted Answer

T&

Answer

The assignment operator should return `T&` (reference to *this) to support chaining such as `a = b = c`.

Question 4

How is the postfix increment operator (++) differentiated from the prefix version when overloading?

Accepted Answer

Postfix takes a dummy int parameter

Answer

The postfix version is declared as `operator++(int)` with a dummy int parameter to distinguish it from the prefix `operator++()`.

Question 5

Which of the following operators MUST be overloaded as a member function?

Accepted Answer

operator=

Answer

The assignment (=), subscript ([]), call (()), and arrow (->) operators must be defined as member functions per the C++ standard.

(CPP) C++ Programming Professional Certificate Practice Test