![]() Unsigned char - type for unsigned character representation. Character types signed char - type for signed character representation. The value of sizeof ( bool ) is implementation defined and might differ from 1. Boolean type bool - type, capable of holding one of the two values: true or false. Note that fixed width integer types are typically aliases of the standard integer types. The extended integer types are implementation-defined. operator and the alignof operator (since C++11). Std::size_t is the unsigned integer type of the result of the sizeof operator as well as the sizeof. See arithmetic operators, in particular integer overflows. Note: integer arithmetic is defined differently for the signed and unsigned integer types. The following table summarizes all available integer types and their properties in various common data models: Note: as with all type specifiers, any order is permitted: unsigned long long int and long int unsigned long name the same type. Long long - target type will have width of at least 64 bits. Long - target type will have width of at least 32 bits. Short - target type will be optimized for space and will have width of at least 16 bits. Unsigned - target type will have unsigned representation Signed - target type will have signed representation (this is the default if omitted) Only one of each group can be present in type name. However, on 32/64 bit systems it is almost exclusively guaranteed to have width of at least 32 bits (see below). If no length modifiers are present, it's guaranteed to have a width of at least 16 bits. The keyword int may be omitted if any of the modifiers listed below are used. Integer types Standard integer types int - basic integer type. 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). ![]() Win32 API (also called the Windows API) with compilation target 64-bit ARM (AArch64) or x86-64 (a.k.a.LLP64 or 4/4/8 ( int and long are 32-bit, pointer is 64-bit).Unix and Unix-like systems (Linux, macOS).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. Sizeof ( std:: nullptr_t ) is equal to sizeof ( void * ). Its values are null pointer constant (see NULL), and may be implicitly converted to any pointer and pointer to member type. It is a distinct type that is not itself a pointer type or a pointer to member type. Std::nullptr_t is the type of the null pointer literal, nullptr.
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