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  • C Standard Library: 11 Implementationdefined Limits: <limits.h> and <float.h>

    The header <limits.h> defines constants for the sizes of integral types.
    The values below are acceptable minimum magnitudes; larger values may be
    used.


    CHAR_BIT 8 bits in a char
    CHAR_MAX UCHAR_MAX or
    SCHAR_MAX maximum value of char
    CHAR_MIN 0 or SCHAR_MIN maximum value of char
    INT_MAX 32767 maximum value of int
    INT_MIN -32767 minimum value of int
    LONG_MAX 2147483647 maximum value of long
    LONG_MIN -2147483647 minimum value of long
    SCHAR_MAX +127 maximum value of signed char
    SCHAR_MIN -127 minimum value of signed char
    SHRT_MAX +32767 maximum value of short
    SHRT_MIN -32767 minimum value of short
    UCHAR_MAX 255 maximum value of unsigned char
    UINT_MAX 65535 maximum value of unsigned int
    ULONG_MAX 4294967295 maximum value of unsigned long
    USHRT_MAX 65535 maximum value of unsigned short

    The names in the table below, a subset of <float.h>, are constants related
    to floating-point arithmetic. When a value is given, it represents the
    minimum magnitude for the corresponding quantity. Each implementation
    defines appropriate values.


    FLT_RADIX 2 radix of exponent, representation, e.g., 2, 16
    FLT_ROUNDS floating-point rounding mode for addition
    FLT_DIG 6 decimal digits of precision
    FLT_EPSILON 1E-5 smallest number x such that 1.0+x != 1.0
    FLT_MANT_DIG number of base FLT_RADIX in mantissa
    FLT_MAX 1E+37 maximum floating-point number
    FLT_MAX_EXP maximum n such that FLT_RADIXn-1 is representable
    FLT_MIN 1E-37 minimum normalized floating-point number
    FLT_MIN_EXP minimum n such that 10n is a normalized number
    DBL_DIG 10 decimal digits of precision
    DBL_EPSILON 1E-9 smallest number x such that 1.0+x != 1.0
    DBL_MANT_DIG number of base FLT_RADIX in mantissa

    DBL_MAX 1E+37 maximum double floating-point number
    DBL_MAX_EXP maximum n such that FLT_RADIXn-1 is representable
    DBL_MIN 1E-37 minimum normalized double floating-point number
    DBL_MIN_EXP minimum n such that 10n is a normalized number

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  • 原文地址:https://www.cnblogs.com/freewater/p/2973801.html
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