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              header

              <cfloat> (float.h)

              Characteristics of floating-point types
              This header describes the characteristics of floating types for the specific system and compiler implementation used.

              A floating-point number is composed of four elements:
              • a sign: either negative or non-negative
              • a base (or radix): which expresses the different numbers that can be represented with a single digit (2 for binary, 10 for decimal, 16 for hexadecimal, and so on...)
              • a significand (or mantissa): which is a series of digits of the aforementioned base. The number of digits in this series is what is known as precision.
              • an exponent (also known as characteristic, or scale): which represents the offset of the significand, affecting the value in the following way:
                value of floating-point = significand x baseexponent, with its corresponding sign.

              Macro constants

              The following panel shows the name of the different values defined in this header and their minimal or maximal values for all implementations (each implementation may set these values as either greater or smaller than this minimum or maximum, as specified):

              When a group of macros exists prefixed by FLT_, DBL_ and LDBL_, the one beginning with FLT_ applies to the float type, the one with DBL_ to double and the one with LDBL_ to long double.

              namevaluestands forexpresses
              FLT_RADIX
              2 or greater    
              RADIXBase for all floating-point types (float, double and long double).
              FLT_MANT_DIG
              DBL_MANT_DIG
              LDBL_MANT_DIG
              MANTissa DIGitsPrecision of significand, i.e. the number of digits that conform the significand.
              FLT_DIG
              DBL_DIG
              LDBL_DIG
              6 or greater
              10 or greater
              10 or greater
              DIGitsNumber of decimal digits that can be rounded into a floating-point and back without change in the number of decimal digits.
              FLT_MIN_EXP
              DBL_MIN_EXP
              LDBL_MIN_EXP
              MINimum EXPonentMinimum negative integer value for the exponent that generates a normalized floating-point number.
              FLT_MIN_10_EXP
              DBL_MIN_10_EXP
              LDBL_MIN_10_EXP
              -37 or smaller
              -37 or smaller
              -37 or smaller
              MINimum base-10 EXPonentMinimum negative integer value for the exponent of a base-10 expression that would generate a normalized floating-point number.
              FLT_MAX_EXP
              DBL_MAX_EXP
              LDBL_MAX_EXP
              MAXimum EXPonentMaximum integer value for the exponent that generates a normalized floating-point number.
              FLT_MAX_10_EXP
              DBL_MAX_10_EXP
              LDBL_MAX_10_EXP
              37 or greater
              37 or greater
              37 or greater
              MAXimum base-10 EXPonentMaximum integer value for the exponent of a base-10 expression that would generate a normalized floating-point number.
              FLT_MAX
              DBL_MAX
              LDBL_MAX
              1E+37 or greater
              1E+37 or greater
              1E+37 or greater
              MAXimumMaximum finite representable floating-point number.
              FLT_EPSILON
              DBL_EPSILON
              LDBL_EPSILON
              1E-5 or smaller
              1E-9 or smaller
              1E-9 or smaller
              EPSILONDifference between 1 and the least value greater than 1 that is representable.
              FLT_MIN
              DBL_MIN
              LDBL_MIN
              1E-37 or smaller
              1E-37 or smaller
              1E-37 or smaller
              MINimumMinimum representable positive floating-point number.
              FLT_ROUNDSROUNDRounding behavior. Possible values:
              -1 undetermined
               0 toward zero
               1 to nearest
               2 toward positive infinity
               3 toward negative infinity
              Applies to all floating-point types (float, double and long double).
              FLT_EVAL_METHODEVALuation METHODProperties of the evaluation format. Possible values:
              -1 undetermined
               0 evaluate just to the range and precision of the type
               1 evaluate float and double as double, and long double as long double.
               2 evaluate all as long double Other negative values indicate an implementation-defined behavior.
              Applies to all floating-point types (float, double and long double).
              DECIMAL_DIGDECIMAL DIGitsNumber of decimal digits that can be rounded into a floating-point type and back again to the same decimal digits, without loss in precision.

              Compatibility

              FLT_EVAL_METHOD and DECIMAL_DIG are defined for libraries complying with the C standard of 1999 or later (which only includes the C++ standard since 2011: C++11).

              See also

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