C language

 

C

Compiler support

Language

Headers

Type support

Program utilities

Variadic function support

Error handling

Dynamic memory management

Strings library

Algorithms

Numerics

Date and time utilities

Input/output support

Localization support

Concurrency support (C11)

Technical Specifications

Symbol index

 

C language

Basic concepts

Keywords

Preprocessor

Statements

Expressions

Initialization

Declarations

Functions

Miscellaneous

History of C

Technical Specifications

 

This is a reference of the core C language constructs.

Basic concepts Comments ASCII chart Character sets and encodings Translation phases Punctuation Identifier - Scope - Lifetime Lookup and Name Spaces Type - Arithmetic types Objects and Alignment The main function As-if rule Undefined behavior Memory model and Data races Keywords Preprocessor #if - #ifdef - #ifndef - #elif #elifdef - #elifndef (C23) #define - # - ## #include - #pragma #line - #error #warning (C23) - #embed (C23) Statements if - switch for while - do-while continue - break goto - return

Expressions Value categories Evaluation order and sequencing Constants and literals   Integer constants   Floating constants   Character constants   true/false (C23)   nullptr (C23)   String literals   Compound literals (C99) Constant expressions Implicit conversions Operators   Member access and indirection   Logical - Comparison   Arithmetic - Assignment   Increment and Decrement   Call, Comma, Ternary   sizeof - alignof (C11)   Cast operators Operator precedence Generic selection (C11) Initialization Scalar Array Structure/Union

Declarations Pointers - Arrays Enumerations Storage duration and Linkage const - volatile - restrict (C99) struct - union - Bit-fields alignas (C11) - typedef static_assert (C11) Atomic types (C11) External and tentative definitions Attributes (C23) Functions Function declaration Function definition inline (C99) _Noreturn (C11) (deprecated in C23) Variadic arguments Miscellaneous History of C Conformance Inline assembly Signal handling Analyzability (C11)

See also

C++ documentation for language constructs