Data Type Constants

 

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Data type constants are implementation-dependent ranges of values allowed for integral data types. The constants listed below give the ranges for the integral data types and are defined in LIMITS.H.

System_CAPS_ICON_note.jpg Note

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

ConstantValueMeaning
SCHAR_MAX127Maximum signed char value
SCHAR_MIN–128Minimum signed char value
UCHAR_MAX255 (0xff)Maximum unsigned char value
CHAR_BIT8Number of bits in a char
USHRT_MAX65535 (0xffff)Maximum unsigned short value
SHRT_MAX32767Maximum (signed) short value
SHRT_MIN–32768Minimum (signed) short value
UINT_MAX4294967295 (0xffffffff)Maximum unsigned int value
ULONG_MAX4294967295 (0xffffffff)Maximum unsigned long value
INT_MAX2147483647Maximum (signed) int value
INT_MIN–2147483647–1Minimum (signed) int value
LONG_MAX2147483647Maximum (signed) long value
LONG_MIN–2147483647–1Minimum (signed) long value
CHAR_MAX127 (255 if /J option used)Maximum char value
CHAR_MIN–128 (0 if /J option used)Minimum char value
MB_LEN_MAX2Maximum number of bytes in multibyte char
_I64_MAX9223372036854775807Maximum (signed) __int64 value
_I64_MIN-9223372036854775807-1Minimum (signed) __int64 value
_UI64_MAX0xffffffffffffffffMaximum (unsigned) __int64 value

The following constants give the range and other characteristics of the double and float data types, and are defined in FLOAT.H:

ConstantValueDescription
DBL_DIG15# of decimal digits of precision
DBL_EPSILON2.2204460492503131e-016Smallest such that 1.0+DBL_EPSILON !=1.0
DBL_MANT_DIG53# of bits in mantissa
DBL_MAX1.7976931348623158e+308Maximum value
DBL_MAX_10_EXP308Maximum decimal exponent
DBL_MAX_EXP1024Maximum binary exponent
DBL_MIN2.2250738585072014e-308Minimum positive value
DBL_MIN_10_EXP(-307)Minimum decimal exponent
DBL_MIN_EXP(–1021)Minimum binary exponent
_DBL_RADIX2Exponent radix
_DBL_ROUNDS1Addition rounding: near
FLT_DIG6Number of decimal digits of precision
FLT_EPSILON1.192092896e-07FSmallest such that 1.0+FLT_EPSILON !=1.0
FLT_MANT_DIG24Number of bits in mantissa
FLT_MAX3.402823466e+38FMaximum value
FLT_MAX_10_EXP38Maximum decimal exponent
FLT_MAX_EXP128Maximum binary exponent
FLT_MIN1.175494351e-38FMinimum positive value
FLT_MIN_10_EXP(–37)Minimum decimal exponent
FLT_MIN_EXP(–125)Minimum binary exponent
FLT_RADIX2Exponent radix
FLT_ROUNDS1Addition rounding: near

Global Constants

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