This is a reference of the core C language constructs.
Basic concepts.
Comments ASCII chart Character sets 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.
main
Keywords.
Preprocessor.
#if - #ifdef - #ifndef - #elif #elifdef - #elifndef(C23) #define - # - ## #include - #pragma #line - #error #warning(C23).
#if
#ifdef
#ifndef
#elif
#elifdef
#elifndef
#define
#
##
#include
#pragma
#line
#error
#warning
Statements.
if - switch for while - do-while continue - break goto - return.
if
switch
for
while
do
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).
true
false
nullptr
sizeof
_Alignof
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).
const
volatile
restrict
struct
union
_Alignas
typedef
_Static_assert
Functions.
Function declaration Function definition inline(C99) _Noreturn(C11)(deprecated in C23) Variadic arguments.
inline
_Noreturn
Miscellaneous.
History of C Conformance Inline assembly Signal handling Analyzability(C11).
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