data-type-constants.md

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Learn more about: Data Type Constants	Data Type Constants	06/25/2018	CHAR_BIT SCHAR_MIN SCHAR_MAX UCHAR_MAX CHAR_MIN CHAR_MAX MB_LEN_MAX SHRT_MIN SHRT_MAX USHRT_MAX INT_MIN INT_MAX UINT_MAX LONG_MIN LONG_MAX ULONG_MAX LLONG_MIN LLONG_MAX ULLONG_MAX _I8_MIN _I8_MAX _UI8_MAX _I16_MIN _I16_MAX _UI16_MAX _I32_MIN _I32_MAX _UI32_MAX _I64_MIN _I64_MAX _UI64_MAX _I128_MIN _I128_MAX _UI128_MAX SIZE_MAX RSIZE_MAX LIMITS/CHAR_BIT LIMITS/SCHAR_MIN LIMITS/SCHAR_MAX LIMITS/UCHAR_MAX LIMITS/CHAR_MIN LIMITS/CHAR_MAX LIMITS/MB_LEN_MAX LIMITS/SHRT_MIN LIMITS/SHRT_MAX LIMITS/USHRT_MAX LIMITS/INT_MIN LIMITS/INT_MAX LIMITS/UINT_MAX LIMITS/LONG_MIN LIMITS/LONG_MAX LIMITS/ULONG_MAX LIMITS/LLONG_MIN LIMITS/LLONG_MAX LIMITS/ULLONG_MAX LIMITS/_I8_MIN LIMITS/_I8_MAX LIMITS/_UI8_MAX LIMITS/_I16_MIN LIMITS/_I16_MAX LIMITS/_UI16_MAX LIMITS/_I32_MIN LIMITS/_I32_MAX LIMITS/_UI32_MAX LIMITS/_I64_MIN LIMITS/_I64_MAX LIMITS/_UI64_MAX LIMITS/_I128_MIN LIMITS/_I128_MAX LIMITS/_UI128_MAX LIMITS/SIZE_MAX LIMITS/RSIZE_MAX DBL_DECIMAL_DIG DBL_DIG DBL_EPSILON DBL_HAS_SUBNORM DBL_MANT_DIG DBL_MAX DBL_MAX_10_EXP DBL_MAX_EXP DBL_MIN DBL_MIN_10_EXP DBL_MIN_EXP _DBL_RADIX DBL_TRUE_MIN FLT_DECIMAL_DIG FLT_DIG FLT_EPSILON FLT_HAS_SUBNORM FLT_MANT_DIG FLT_MAX FLT_MAX_10_EXP FLT_MAX_EXP FLT_MIN FLT_MIN_10_EXP FLT_MIN_EXP FLT_RADIX FLT_TRUE_MIN LDBL_DIG LDBL_EPSILON LDBL_HAS_SUBNORM LDBL_MANT_DIG LDBL_MAX LDBL_MAX_10_EXP LDBL_MAX_EXP LDBL_MIN LDBL_MIN_10_EXP LDBL_MIN_EXP _LDBL_RADIX LDBL_TRUE_MIN DECIMAL_DIG FLOAT/DBL_DECIMAL_DIG FLOAT/DBL_DIG FLOAT/DBL_EPSILON FLOAT/DBL_HAS_SUBNORM FLOAT/DBL_MANT_DIG FLOAT/DBL_MAX FLOAT/DBL_MAX_10_EXP FLOAT/DBL_MAX_EXP FLOAT/DBL_MIN FLOAT/DBL_MIN_10_EXP FLOAT/DBL_MIN_EXP FLOAT/_DBL_RADIX FLOAT/DBL_TRUE_MIN FLOAT/FLT_DECIMAL_DIG FLOAT/FLT_DIG FLOAT/FLT_EPSILON FLOAT/FLT_HAS_SUBNORM FLOAT/FLT_MANT_DIG FLOAT/FLT_MAX FLOAT/FLT_MAX_10_EXP FLOAT/FLT_MAX_EXP FLOAT/FLT_MIN FLOAT/FLT_MIN_10_EXP FLOAT/FLT_MIN_EXP FLOAT/FLT_RADIX FLOAT/FLT_TRUE_MIN FLOAT/LDBL_DIG FLOAT/LDBL_EPSILON FLOAT/LDBL_HAS_SUBNORM FLOAT/LDBL_MANT_DIG FLOAT/LDBL_MAX FLOAT/LDBL_MAX_10_EXP FLOAT/LDBL_MAX_EXP FLOAT/LDBL_MIN FLOAT/LDBL_MIN_10_EXP FLOAT/LDBL_MIN_EXP FLOAT/_LDBL_RADIX FLOAT/LDBL_TRUE_MIN FLOAT/DECIMAL_DIG	DBL_MAX_EXP constant _DBL_RADIX constant FLT_MIN_EXP constant DBL_EPSILON constant INT_MIN constant FLT_EPSILON constant DBL_MANT_DIG constant _FLT_RADIX constant DBL_MIN constant USHRT_MAX constant FLT_MAX_10_EXP constant _FLT_ROUNDS constant data type constants [C++] _DBL_ROUNDS constant CHAR_MAX constant FLT_MAX_EXP constant FLT_MIN constant CHAR_MIN constant FLT_MIN_10_EXP constant DBL_MIN_EXP constant SCHAR_MAX constant FLT_RADIX constant CHAR_BIT constant UCHAR_MAX constant DBL_RADIX constant FLT_ROUNDS constant LONG_MIN constant SHRT_MAX constant LONG_MAX constant DBL_MAX_10_EXP constant DBL_MIN_10_EXP constant INT_MAX constant constants [C++], data type ULONG_MAX constant FLT_DIG constant MB_LEN_MAX constant DBL_DIG constant SHRT_MIN constant DBL_MAX constant DBL_ROUNDS constant FLT_MAX constant UINT_MAX constant FLT_MANT_DIG constant SCHAR_MIN constant LLONG_MIN constant LLONG_MAX constant ULLONG_MAX constant _I8_MIN constant _I8_MAX constant _UI8_MAX constant _I16_MIN constant _I16_MAX constant _UI16_MAX constant _I32_MIN constant _I32_MAX constant _UI32_MAX constant _I64_MIN constant _I64_MAX constant _UI64_MAX constant _I128_MIN constant _I128_MAX constant _UI128_MAX constant SIZE_MAX constant RSIZE_MAX constant

Data type constants

Data type constants are implementation-dependent ranges of values allowed for integral and floating-point data types.

Integral type constants

These constants give the ranges for the integral data types. To use these constants, include the limits.h header in your source file:

#include <limits.h>

Note

The /J compiler option changes the default char type from signed char to unsigned char.

Constant	Value	Description
CHAR_BIT	8	Number of bits in a char
SCHAR_MIN	(-128)	Minimum signed char value
SCHAR_MAX	127	Maximum signed char value
UCHAR_MAX	255 (0xff)	Maximum unsigned char value
CHAR_MIN	(-128) (0 if /J option used)	Minimum char value
CHAR_MAX	127 (255 if /J option used)	Maximum char value
MB_LEN_MAX	5	Maximum number of bytes in multibyte char
SHRT_MIN	-32768	Minimum signed short value
SHRT_MAX	32767	Maximum signed short value
USHRT_MAX	65535 (0xffff)	Maximum unsigned short value
INT_MIN	(-2147483647 - 1)	Minimum signed int value
INT_MAX	2147483647	Maximum signed int value
UINT_MAX	4294967295 (0xffffffff)	Maximum unsigned int value
LONG_MIN	(-2147483647L - 1)	Minimum signed long value
LONG_MAX	2147483647L	Maximum signed long value
ULONG_MAX	4294967295UL (0xfffffffful)	Maximum unsigned long value
LLONG_MIN	(-9223372036854775807LL - 1)	Minimum signed long long or __int64 value
LLONG_MAX	9223372036854775807LL	Maximum signed long long or __int64 value
ULLONG_MAX	0xffffffffffffffffull	Maximum unsigned long long value
_I8_MIN	(-127i8 - 1)	Minimum signed 8-bit value
_I8_MAX	127i8	Maximum signed 8-bit value
_UI8_MAX	0xffui8	Maximum unsigned 8-bit value
_I16_MIN	(-32767i16 - 1)	Minimum signed 16-bit value
_I16_MAX	32767i16	Maximum signed 16-bit value
_UI16_MAX	0xffffui16	Maximum unsigned 16-bit value
_I32_MIN	(-2147483647i32 - 1)	Minimum signed 32-bit value
_I32_MAX	2147483647i32	Maximum signed 32-bit value
_UI32_MAX	0xffffffffui32	Maximum unsigned 32-bit value
_I64_MIN	(-9223372036854775807 - 1)	Minimum signed 64-bit value
_I64_MAX	9223372036854775807	Maximum signed 64-bit value
_UI64_MAX	0xffffffffffffffffui64	Maximum unsigned 64-bit value
_I128_MIN	(-170141183460469231731687303715884105727i128 - 1)	Minimum signed 128-bit value
_I128_MAX	170141183460469231731687303715884105727i128	Maximum signed 128-bit value
_UI128_MAX	0xffffffffffffffffffffffffffffffffui128	Maximum unsigned 128-bit value
SIZE_MAX	same as _UI64_MAX if _WIN64 is defined, or UINT_MAX	Maximum native integer size
RSIZE_MAX	same as (SIZE_MAX >> 1)	Maximum secure library integer size

Floating-point type constants

The following constants give the range and other characteristics of the long double, double and float data types. To use these constants, include the float.h header in your source file:

#include <float.h>

Constant	Value	Description
DBL_DECIMAL_DIG	17	# of decimal digits of rounding precision
DBL_DIG	15	# of decimal digits of precision
DBL_EPSILON	2.2204460492503131e-016	Smallest such that 1.0 + DBL_EPSILON != 1.0
DBL_HAS_SUBNORM	1	Type supports subnormal (denormal) numbers
DBL_MANT_DIG	53	# of bits in significand (mantissa)
DBL_MAX	1.7976931348623158e+308	Maximum value
DBL_MAX_10_EXP	308	Maximum decimal exponent
DBL_MAX_EXP	1024	Maximum binary exponent
DBL_MIN	2.2250738585072014e-308	Minimum normalized positive value
DBL_MIN_10_EXP	(-307)	Minimum decimal exponent
DBL_MIN_EXP	(-1021)	Minimum binary exponent
_DBL_RADIX	2	Exponent radix
DBL_TRUE_MIN	4.9406564584124654e-324	Minimum positive subnormal value
FLT_DECIMAL_DIG	9	Number of decimal digits of rounding precision
FLT_DIG	6	Number of decimal digits of precision
FLT_EPSILON	1.192092896e-07F	Smallest such that 1.0 + FLT_EPSILON != 1.0
FLT_HAS_SUBNORM	1	Type supports subnormal (denormal) numbers
FLT_MANT_DIG	24	Number of bits in significand (mantissa)
FLT_MAX	3.402823466e+38F	Maximum value
FLT_MAX_10_EXP	38	Maximum decimal exponent
FLT_MAX_EXP	128	Maximum binary exponent
FLT_MIN	1.175494351e-38F	Minimum normalized positive value
FLT_MIN_10_EXP	(-37)	Minimum decimal exponent
FLT_MIN_EXP	(-125)	Minimum binary exponent
FLT_RADIX	2	Exponent radix
FLT_TRUE_MIN	1.401298464e-45F	Minimum positive subnormal value
LDBL_DIG	15	# of decimal digits of precision
LDBL_EPSILON	2.2204460492503131e-016	Smallest such that 1.0 + LDBL_EPSILON != 1.0
LDBL_HAS_SUBNORM	1	Type supports subnormal (denormal) numbers
LDBL_MANT_DIG	53	# of bits in significand (mantissa)
LDBL_MAX	1.7976931348623158e+308	Maximum value
LDBL_MAX_10_EXP	308	Maximum decimal exponent
LDBL_MAX_EXP	1024	Maximum binary exponent
LDBL_MIN	2.2250738585072014e-308	Minimum normalized positive value
LDBL_MIN_10_EXP	(-307)	Minimum decimal exponent
LDBL_MIN_EXP	(-1021)	Minimum binary exponent
_LDBL_RADIX	2	Exponent radix
LDBL_TRUE_MIN	4.9406564584124654e-324	Minimum positive subnormal value
DECIMAL_DIG	same as DBL_DECIMAL_DIG	Default (double) decimal digits of rounding precision

See also

Global constants