C reference

From cppreference.com

C89, C95, C99, C11, C17, C23 │ Compiler support C99, C23
Language Basic concepts Keywords Preprocessor Expressions Declaration Initialization Functions Statements Headers Type support	Program utilities Variadic functions Diagnostics library Dynamic memory management Strings library Null-terminated strings: byte − multibyte − wide Date and time library Localization library Input/output library	Algorithms library Numerics library Common mathematical functions Floating-point environment (C99) Pseudo-random number generation Complex number arithmetic (C99) Type-generic math (C99) Bit manipulation (C23) Checked integer arithmetic (C23) Concurrency support library (C11)
Technical specifications Dynamic memory extensions (dynamic memory TR) Floating-point extensions, Part 1 (FP Ext 1 TS) Floating-point extensions, Part 4 (FP Ext 4 TS)
External Links − Non-ANSI/ISO Libraries − Index − Symbol Index