常用的数据类型常量

最新推荐文章于 2022-04-22 08:00:00 发布

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本文详细介绍了C/C++中的数据类型常量，包括整型家族的最大值、最小值以及位数等信息，以及double和float类型的精度、最大值、最小值等关键参数。这些常量在编程中对于理解和使用不同数据类型至关重要。

整型家族的常量	值	意义
SCHAR_MAX	127	Maximum signed char value
SCHAR_MIN	-128	Minimum signed char value
UCHAR_MAX	255 (0xff)	Maximum unsigned char value
CHAR_BIT	8	Number of bits in a char
USHRT_MAX	65535 (0xffff)	Maximum unsigned short value
SHRT_MAX	32767	Maximum (signed) short value
SHRT_MIN	–32768	Minimum (signed) short value
UINT_MAX	4294967295(0xffffffff)	Maximum unsigned int value
ULONG_MAX	4294967295 (0xffffffff)	Maximum unsigned long value
INT_MAX	2147483647	Maximum (signed) int value
INT_MIN	–2147483647–1	Minimum (signed) int value
LONG_MAX	2147483647	Maximum (signed) long value
LONG_MIN	–2147483647–1	Minimum (signed) long value
CHAR_MAX	127(255 if /J option used)	Maximum char value
CHAR_MIN	–128(0 if /J option used)	Minimum char value
MB_LEN_MAX	2	Maximum number of bytes in multibyte char

double、float的常量	值	意义
DBL_DIG	15	# of decimal digits of precision
DBL_EPSILON	2.2204460492503131e-016	Smallest such that 1.0+DBL_EPSILON !=1.0
DBL_MANT_DIG	53	# of bits in 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 positive value
DBL_MIN_10_EXP	(-307)	Minimum decimal exponent
DBL_MIN_EXP	(–1021)	Minimum binary exponent
_DBL_RADIX	2	Exponent radix
_DBL_ROUNDS	1	Addition rounding: near
FLT_DIG	6	Number of decimal digits of precision
FLT_EPSILON	1.192092896e-07F	Smallest such that 1.0+FLT_EPSILON !=1.0
FLT_MANT_DIG	24	Number of bits in 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 positive value
FLT_MIN_10_EXP	(–37)	Minimum decimal exponent
FLT_MIN_EXP	(–125)	Minimum binary exponent
FLT_RADIX	2	Exponent radix
FLT_ROUNDS	1	Addition rounding: near