![]() ![]() ![]() long double - extended precision floating-point type.Matches IEEE-754 binary64 format if supported. double - double precision floating-point type.Matches IEEE-754 binar圓2 format if supported. float - single precision floating-point type.Note that exact-width integer types are available in since C99.Ĭ has three or six (since C23) types for representing real floating-point values: For example, ILP64 ( 8/8/8: int, long, and pointer are 64-bit) only appeared in some early 64-bit Unix systems (e.g. LP64 or 4/8/8 (int is 32-bit, long and pointer are 64-bit).LLP64 or 4/4/8 (int and long are 32-bit, pointer is 64-bit).Unix and Unix-like systems (Linux, Mac OS X).ILP32 or 4/4/4 (int, long, and pointer are 32-bit).LP32 or 2/4/4 (int is 16-bit, long and pointer are 32-bit).The choices made by each implementation about the sizes of the fundamental types are collectively known as data model. See arithmetic operators, in particular integer overflows. Note: integer arithmetic is defined differently for the signed and unsigned integer types. Note: this allows the extreme case in which byte are sized 64 bits, all types (including char) are 64 bits wide, and sizeof returns 1 for every type. The following table summarizes all available integer types and their properties:īesides the minimal bit counts, the C Standard guarantees thatġ = sizeof ( char ) ≤ sizeof ( short ) ≤ sizeof ( int ) ≤ sizeof ( long ) ≤ sizeof ( long long ). Note: as with all type specifiers, any order is permitted: unsigned long long int and long int unsigned long name the same type. unsigned _Bitint (n ) (where n is replaced by precise width, that cannot be larger than BITINT_MAXWIDTH from )._Bitint (n ) (where n is replaced by precise width, that cannot be larger than BITINT_MAXWIDTH from ).unsigned long long int (also accessible as unsigned long long).long long int (also accessible as long long).unsigned long int (also accessible as unsigned long).unsigned int (also accessible as unsigned), the unsigned counterpart of int, implementing modulo arithmetic.Most current systems use 32 bits (see Data models below). This is the most optimal integer type for the platform, and is guaranteed to be at least 16 bits. unsigned short int (also accessible as unsigned short).short int (also accessible as short, may use the keyword signed).Note that the standard library also defines typedef names wchar_t, char16_t and char32_t (since C11) to represent wide characters and char8_t for UTF-8 characters (since C23). Equivalent to either signed char or unsigned char (which one is implementation-defined and may be controlled by a compiler commandline switch), but char is a distinct type, different from both signed char and unsigned char. char - type for character representation.Also used to inspect object representations (raw memory). unsigned char - type for unsigned character representation.signed char - type for signed character representation.Note that conversion to _Bool does not work the same as conversion to other integer types: (bool ) 0.5 evaluates to 1, whereas ( int ) 0.5 evaluates to 0. _Bool (also accessible as the macro bool) - type, capable of holding one of the two values: 1 and 0 (also accessible as the macros true and false). ![]()
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