#c++

11 c++ interview questions, asked at Nvidia, Amazon, Apple and 4 more companies. Last asked Sep 2026.

Write a usage example for an unfamiliar C++ classCodingInstead of an algorithm, you get a short C++ class you have never seen that owns a resource. Write a small program that shows how the class is meant to be used, then explain what…
Last asked Sep 2026
Thread-safe reference-counted smart pointer in C++CodingImplement a reference-counted smart pointer class template in C++ from scratch, in the spirit of std::sharedptr. Several owners can share one object; it is destroyed exactly once…
Last asked Sep 2026
Implement the Linux cp command, then explain what happens underneathCodingWrite a version of cp that copies a file to a destination. Then expect the discussion to go deep: system calls versus buffered I/O, buffer sizes, file descriptors and permissions…
Last asked Sep 2026
Reassemble a stream of TLV messages in CCodingMessages arrive over a byte stream in type-length-value (TLV) form: a type, a length, then that many bytes of value. The stream is delivered in chunks of arbitrary size, so one…
Last asked Aug 2026
Firmware fundamentals: endianness, ring buffers and the stackCodingAnswer and code short firmware questions: what big- and little-endian mean and how to detect or convert byte order, how a ring buffer works between an interrupt handler and the…
Last asked Jul 2026
CPU microarchitecture and simulator designCodingFor a CPU architect role: read and reason about assembly code; explain microarchitecture parts such as branch predictors, the MOESI coherence protocol, caches and MSHRs, VIPT…
Last asked Mar 2026
Debug a staged C++ project with AI tools allowedCodingA C++ program is split into stages, each hiding a logic error, a memory bug or a race. Run it, observe the output, and fix each stage, using an AI assistant if you like while…
Last asked Feb 2026
Polynomial multiplication API in CCodingDesign and implement a small C API for polynomials: a representation, creation and freeing, and a function that multiplies two polynomials and returns a new one. Pay attention to…
Last asked Feb 2026
Implement memcpy with misaligned addressesCodingWrite memcpy: copy n bytes from a source address to a destination address. Copying one byte at a time is slow, so copy in machine words, and handle source and destination pointers…
Last asked Jan 2026
Optimize a small-string class in C++CodingBuild a high-performance C++ string class for a workload with very many strings, supporting operations such as compare, concatenate and substring. Short strings live in a…
Last asked Dec 2025
C++ performance round with provided threading codeCodingA 60-minute coding round for performance-minded roles, held in C++. The focus is on core C++ performance, with a smaller part on concurrency; the threading components are…
Last asked Sep 2025