C++: practice, test and prove it

C++ fundamentals: classes, constructors, references, virtual functions, overloading, STL containers and RAII.

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C++ screenings build on C knowledge and then test object-oriented behaviour and the standard library. Common questions ask in what order constructors and destructors run, whether a call reaches the base or the derived version, how references differ from pointers, and how vector and map behave.

This page gives you practice with those patterns. The lessons explain object lifetime and RAII first, then inheritance and virtual functions, because those two areas produce most of the tricky output questions.

Benchmark: The pass mark on this site is 80%, and C++ is commonly screened for systems, game, embedded and performance-focused developer roles. Requirements vary by employer.

Lessons

Object lifetime, references and RAII in C++When constructors and destructors run, how references differ from pointers, and why RAII makes resource handling safe.Lesson 1

Inheritance and virtual functions in C++How virtual dispatch decides which function runs, why base classes need virtual destructors, and how overloading resolves.Lesson 2

STL in practice: vector, map, set and iteratorsUse vector, map, unordered_map and set correctly, search with find, erase while iterating, and avoid the operator[] insert trap.Lesson 3

Copy, move and operator overloadingWhen the copy constructor, copy assignment and move constructor run, the rule of three, and how to overload operators without surprises.Lesson 4

Interview prep

C++ interview questionsC++ questions that come up often in technical interviews, with answers that explain how the language actually behaves.6 questions

Certificate

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Common questions

Which C++ standard should I study?

Most screening questions use features from C++11 onward, such as auto, range-based for loops and smart pointers. C++17 is a safe baseline for practice.

Do I need to know C before C++?

It helps with pointers and memory, but it is not required. Modern C++ encourages references, containers and smart pointers in place of many C-style techniques.

How much of the STL should I know?

Know vector, string, map, unordered_map and set well, including insertion, lookup and iteration. A few algorithms such as sort and find are also worth knowing.

C++ test for interviewWhat the screening round looks like, with a 5-question sample.