C++ 변수 타입 + limits.h & stdint.h

1. C++ Value type

 

Group	Type names*	Notes on size / precision
Character types	char	Exactly one byte in size. At least 8 bits.
	char16_t	Not smaller than char. At least 16 bits.
	char32_t	Not smaller than char16_t. At least 32 bits.
	wchar_t	Can represent the largest supported character set.
Integer types (signed)	signed char	Same size as char. At least 8 bits.
	signed  short int	Not smaller than char. At least 16 bits.
	signed  int	Not smaller than short. At least 16 bits.
	signed  long int	Not smaller than int. At least 32 bits.
	signed  long long int	Not smaller than long. At least 64 bits.
Integer types (unsigned)	unsigned char	(same size as their signed counterparts)
	unsigned short int
	unsigned int
	unsigned long int
	unsigned long long int
Floating-point types	float
	double	Precision not less than float
	long double	Precision not less than double
Boolean type	bool
Void type	void	no storage
Null pointer	decltype(nullptr)

               - ref : http://www.cplusplus.com/doc/tutorial/variables/

2. stdint.h

 

signed type	unsigned type	description
intmax_t	uintmax_t	Integer type with the maximum width supported.
int8_t	uint8_t	Integer type with a width of exactly 8, 16, 32, or 64 bits. For signed types, negative values are represented using 2's complement. No padding bits. Optional: These typedefs are not defined if no types with such characteristics exist.*
int16_t	uint16_t
int32_t	uint32_t
int64_t	uint64_t
int_least8_t	uint_least8_t	Integer type with a minimum of 8, 16, 32, or 64 bits. No other integer type exists with lesser size and at least the specified width.
int_least16_t	uint_least16_t
int_least32_t	uint_least32_t
int_least64_t	uint_least64_t
int_fast8_t	uint_fast8_t	Integer type with a minimum of 8, 16, 32, or 64 bits. At least as fast as any other integer type with at least the specified width.
int_fast16_t	uint_fast16_t
int_fast32_t	uint_fast32_t
int_fast64_t	uint_fast64_t
intptr_t	uintptr_t	Integer type capable of holding a value converted from a void pointer and then be converted back to that type with a value that compares equal to the original pointer. Optional: These typedefs may not be defined in some library implementations.*

             - ref : http://www.cplusplus.com/reference/cstdint/?kw=stdint.h

 

 

3. limits.h

 

              - ref : http://www.cplusplus.com/reference/climits/