C++ Interview Programs

Interview Practice Index

C++ interview programs are compact coding tasks that check syntax, loops, arrays or vectors, references, and clear reasoning. Each tutorial here uses the same CodeToFun layout—overview, algorithm, full solution, FAQs, and complexity—so you always know where to look.

Interview Programs in C++

C++ rounds often span the same pillars as other compiled languages, but expect extra emphasis on types, references, and safe resource habits:

• Core language: types, operators, if/else, loops, functions, and namespaces.
• Arrays and strings: C-style arrays for small demos; std::vector, std::string, and iterators when you need flexibility.
• Pointers and references: swap helpers, array decay, and passing by reference for outputs.
• Linked structures: nodes, traversal, insert/delete when the interviewer moves beyond arrays.
• Recursion and backtracking: combinations, divide-and-conquer, and careful base cases.
• Searching and sorting: linear scans, binary search patterns, and classic O(n log n) sorts.
• Dynamic memory: new/delete (or new[]/delete[]), pairing every allocation with a release—or prefer RAII containers.
• Streams and files: std::cin/std::cout, std::ifstream/std::ofstream when I/O matters.
• Data structures: stacks, queues, heaps, trees, and graphs—often starting from problems on this index.
• Problem-solving: stating assumptions, validating input, and naming complexity confidently.

Working through the cards below builds fluency for whiteboard rounds and timed IDE sessions alike.