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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../header/../../c/header/float.html below:

Standard library header <float.h> - cppreference.com

This header is part of the type support library, in particular its numeric limits interface.

[edit] Macros the radix (integer base) used by the representation of all three floating-point types
(macro constant) conversion from long double to decimal with at least DECIMAL_DIG digits and back to long double is the identity conversion: this is the decimal precision required to serialize/deserialize a long double
(macro constant)

FLT_DECIMAL_DIGDBL_DECIMAL_DIGLDBL_DECIMAL_DIG

(C11)

conversion from float/double/long double to decimal with at least FLT_DECIMAL_DIG/DBL_DECIMAL_DIG/LDBL_DECIMAL_DIG digits and back is the identity conversion: this is the decimal precision required to serialize/deserialize a floating-point value. Defined to at least 6, 10, and 10 respectively, or 9 for IEEE float and 17 for IEEE double (see also the C++ analog: max_digits10)
(macro constant) minimum, normalized, positive value of float, double and long double respectively
(macro constant)

FLT_TRUE_MINDBL_TRUE_MINLDBL_TRUE_MIN

(C11)

minimum positive value of float, double and long double respectively
(macro constant) maximum finite value of float, double and long double respectively
(macro constant)

FLT_EPSILONDBL_EPSILONLDBL_EPSILON

absolute value difference between 1.0 and the next representable value for float, double and long double respectively
(macro constant) number of decimal digits that are guaranteed to be preserved in text → float/double/long double → text roundtrip without change due to rounding or overflow (see the C++ analog digits10 for detail)
(macro constant)

FLT_MANT_DIGDBL_MANT_DIGLDBL_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
(macro constant)

FLT_MIN_EXPDBL_MIN_EXPLDBL_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
(macro constant)

FLT_MIN_10_EXPDBL_MIN_10_EXPLDBL_MIN_10_EXP

minimum negative integer such that 10 raised to that power is a normalized float, double and long double respectively
(macro constant)

FLT_MAX_EXPDBL_MAX_EXPLDBL_MAX_EXP

maximum positive integer such that FLT_RADIX raised by power one less than that integer is a representable finite float, double and long double respectively
(macro constant)

FLT_MAX_10_EXPDBL_MAX_10_EXPLDBL_MAX_10_EXP

maximum positive integer such that 10 raised to that power is a representable finite float, double and long double respectively
(macro constant) rounding mode of floating-point arithmetic
(macro constant) specifies in what precision all arithmetic operations are done
(macro constant)

FLT_HAS_SUBNORMDBL_HAS_SUBNORMLDBL_HAS_SUBNORM

(C11)(deprecated in C23)

whether the type supports subnormal (denormal) numbers:
-1 – indeterminable, â0â – absent, 1 – present
(macro constant) [edit] Synopsis

#define FLT_ROUNDS           /* see definition */
#define FLT_EVAL_METHOD      /* see definition */
#define FLT_HAS_SUBNORM      /* see definition */
#define DBL_HAS_SUBNORM      /* see definition */
#define LDBL_HAS_SUBNORM     /* see definition */
#define FLT_RADIX            /* see definition */
#define FLT_MANT_DIG         /* see definition */
#define DBL_MANT_DIG         /* see definition */
#define LDBL_MANT_DIG        /* see definition */
#define FLT_DECIMAL_DIG      /* see definition */
#define DBL_DECIMAL_DIG      /* see definition */
#define LDBL_DECIMAL_DIG     /* see definition */
#define DECIMAL_DIG          /* see definition */
#define FLT_DIG              /* see definition */
#define DBL_DIG              /* see definition */
#define LDBL_DIG             /* see definition */
#define FLT_MIN_EXP          /* see definition */
#define DBL_MIN_EXP          /* see definition */
#define LDBL_MIN_EXP         /* see definition */
#define FLT_MIN_10_EXP       /* see definition */
#define DBL_MIN_10_EXP       /* see definition */
#define LDBL_MIN_10_EXP      /* see definition */
#define FLT_MAX_EXP          /* see definition */
#define DBL_MAX_EXP          /* see definition */
#define LDBL_MAX_EXP         /* see definition */
#define FLT_MAX_10_EXP       /* see definition */
#define DBL_MAX_10_EXP       /* see definition */
#define LDBL_MAX_10_EXP      /* see definition */
#define FLT_MAX              /* see definition */
#define DBL_MAX              /* see definition */
#define LDBL_MAX             /* see definition */
#define FLT_EPSILON          /* see definition */
#define DBL_EPSILON          /* see definition */
#define LDBL_EPSILON         /* see definition */
#define FLT_MIN              /* see definition */
#define DBL_MIN              /* see definition */
#define LDBL_MIN             /* see definition */
#define FLT_TRUE_MIN         /* see definition */
#define DBL_TRUE_MIN         /* see definition */
#define LDBL_TRUE_MIN        /* see definition */

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