C Library Header – float

<float.h> header describes the characteristics of floating types for the specific system.

The <float.h> header shall define the following macro constants:

FLT_RADIX	the radix (integer base) used by the representation of all three floating-point types
DECIMAL_DIG	number of decimal digits that can be converted to long double and back without losing precision(C99)
FLT_DECIMAL_DIG DBL_DECIMAL_DIG LDBL_DECIMAL_DIG	number of decimal digits such that any floating-point number can be rounded to a floating-point number with this many decimal digits and back again without change to the value. Defined to at least 6, 10, and 10 respectively. (C11)
FLT_MIN DBL_MIN LDBL_MIN	minimum normalized positive value of float, double, long double respectively
FLT_TRUE_MIN DBL_TRUE_MIN LDBL_TRUE_MIN	minimum positive value of float, double, long double respectively (C11)
FLT_MAX DBL_MAX LDBL_MAX	maximum finite value of float, double, long double, respectively
FLT_EPSILON DBL_EPSILON LDBL_EPSILON	difference between 1.0 and the next representable value for float, double and long double respectively
FLT_DIG DBL_DIG LDBL_DIG	number of decimal digits that can be represented without losing precision for float, double and long double respectively
FLT_MANT_DIG DBL_MANT_DIG LDBL_MANT_DIG	number of base-FLT_RADIX digits that are in the floating-point mantissa and that can be represented without losing precision for float, double and long double respectively
FLT_MIN_EXP DBL_MIN_EXP LDBL_MIN_EXP	minimum negative integer such that FLT_RADIX raised by power one less than that integer is a normalized float, double and long double respectively
FLT_MIN_10_EXP DBL_MIN_10_EXP LDBL_MIN_10_EXP	minimum negative integer such that 10 raised by power one less than that integer is a normalized float, double and long double respectively
FLT_MAX_EXP DBL_MAX_EXP LDBL_MAX_EXP	maximum positive integer such that FLT_RADIX raised by power one less than that integer is a normalized float, double and long double respectively
FLT_MAX_10_EXP DBL_MAX_10_EXP LDBL_MAX_10_EXP	maximum positive integer such that 10 raised by power one less than that integer is a normalized float, double and long double respectively
FLT_ROUNDS	rounding mode of floating-point arithmetics, equal to float_round_style
FLT_EVAL_METHOD	use of extended precision for intermediate results: 0 not used, 1 double is used instead of float, 2: long double is used (C99)
FLT_HAS_SUBNORM DBL_HAS_SUBNORM LDBL_HAS_SUBNORM	whether the type supports subnormal (denormal) numbers: -1 indeterminable, 0 absent, 1 present (C11)

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Related topics:
<assert.h>   |   <complex.h>   |   <ctype.h>   |   <errno.h>   |   <fenv.h>   |   Standard Library in C

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