float.h

Defines constants describing the properties of floating point arithmetic. Refer to the following tables:

Table 1. Rounding and Radix Constants
Constant	Description
`FLT_ROUNDS`	Gives the rounding mode implemented
`FLT_RADIX`	The base of the exponent

All other constants are prefixed by either FLT_, DBL_ or LDBL_. FLT_ is a constant for type float, DBL_ for double and LDBL_ for longdouble.

Table 2. Other constants defined in float.h
Constant	Description
`DIG`	Number of significant digits.
`EPSILON`	Smallest positive `x` for which `1.0 + x != x`.
`MANT_DIG`	Number of binary mantissa digits.
`MAX`	Largest normalized finite value.
`MAX_EXP`	Maximum exponent such that FLT_RADIXMAX_EXP is a finite normalized value.
`MAX_10_EXP`	Maximum exponent such that 10MAX_10_EXP is a finite normalized value.
`MIN`	Smallest positive normalized value.
`MIN_EXP`	Smallest negative exponent such that FLT_RADIXMIN_EXP is a normalized value.
`MIN_10_EXP`	Smallest negative exponent such that 10MIN_10_EXP is a normalized value.