C++ Handbook

All C Standard Headers

All C Standard Headers

A compact scan page listing C standard headers only, optimized for quick lookup.

How to use this reference page

Use reference pages to confirm names, categories, nearby facilities, and the constraints that matter before writing or reviewing code.

  • Scan the top of the page first to identify the primary types, functions, or algorithm families involved.
  • Use the nearby-page links when your question is really about a companion header, related algorithm family, or broader subsystem.
  • Validate tricky behavior with a small compileable example before relying on memory for details like invalidation, ordering, allocation, or lifetime rules.

All C Standard Headers

This page is optimized for scanning only C headers. Use C standard headers index when you want grouped explanations.

Core and diagnostics

Text, memory, and localization

Utilities and language support

I/O, math, time, and concurrency

Practical use

Example in practice

int main() {
    // Pick one facility from this reference page.
    // Write the smallest program that exercises its main precondition,
    // complexity rule, or lifetime constraint before scaling up.
    return 0;
}