C reference

C89, C95, C99, C11, C17, C23
Language Basic concepts Keywords Preprocessor Expressions Declaration Initialization Functions Statements Headers	Type support Program utilities Variadic functions Error handling Dynamic memory management Date and time utilities Strings library Null-terminated strings: byte − multibyte − wide Algorithms	Numerics Common mathematical functions Floating-point environment (C99) Pseudo-random number generation Complex number arithmetic (C99) Type-generic math (C99) Input/output support Localization support Atomic operations library (C11) Thread 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