B.11 Implementation-defined Limits: and
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