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C++ and C Interview Questions & Answers

C++ Technical Interview Questions

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How does RAII prevent resource leaks in C++?

Resource acquisition is initialization binds a resource’s lifetime to an object whose destructor performs cleanup. Stack unwinding destroys fully constructed local objects when exceptions propagate, m...

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When should you choose unique_ptr, shared_ptr, or a non-owning pointer in C++?

Use std::unique_ptr for exclusive dynamic ownership and transfer ownership explicitly with move semantics. Use std::shared_ptr only when independently managed shared ownership is actually required. A ...

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Why is returning a pointer to a local variable invalid, and what are safer alternatives?

An ordinary local variable with automatic storage duration ceases to exist when the function returns. A pointer to it then dangles, and accessing the former object through that pointer is invalid even...

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Why can a C++ base class need a virtual destructor?

When an object is destroyed through a base pointer, a public virtual destructor permits the derived destructor to run correctly. Deleting a derived object through a base pointer without a suitable vir...

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