C reference

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