Is it const?

What this C++ const-correctness question tests

This is an easy C++ language-knowledge question that probes your understanding of const semantics in modern C++ (C++11 and later). It appears frequently in technical interviews because const-correctness is foundational to writing safe, maintainable code in production systems.

To answer correctly, you need to reason about how const qualifiers interact with different contexts—member functions, pointers, references, and object declarations. The question rewards precise knowledge of the language rules over guesswork, and interviewers often use it as a quick filter for candidates who have actually written and debugged C++ rather than merely studied it.

• Const member functions vs. const objects
• Const pointers and pointers to const data
• Mutable members and their role in const objects
• C++11 features and their const behavior