Standard library header <float.h>
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C
Concurrency support (C11)
Standard Library headers
<stdmchar.h> (C29)
<stdnoreturn.h> (C11*)
<tgmath.h> (C99)
<threads.h> (C11)
<uchar.h> (C11)
<wchar.h> (C95)
<wctype.h> (C95)
This header is part of the type support library, in particular its numeric limits interface.
[edit] Macros
FLT_RADIX
(macro constant)
DECIMAL_DIG
(C99)
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)
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)
FLT_MINDBL_MINLDBL_MIN
(macro constant)
FLT_TRUE_MINDBL_TRUE_MINLDBL_TRUE_MIN
(C11)
(macro constant)
FLT_MAXDBL_MAXLDBL_MAX
(macro constant)
FLT_EPSILONDBL_EPSILONLDBL_EPSILON
(macro constant)
FLT_DIGDBL_DIGLDBL_DIG
digits10 for detail) (macro constant)
FLT_MANT_DIGDBL_MANT_DIGLDBL_MANT_DIG
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
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
(macro constant)
FLT_MAX_EXPDBL_MAX_EXPLDBL_MAX_EXP
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
(macro constant)
(C99)
(macro constant)
FLT_HAS_SUBNORMDBL_HAS_SUBNORMLDBL_HAS_SUBNORM
(C11)(deprecated in C23)
-1 – indeterminable, 0 – absent, 1 – present
(macro constant)
This section is incomplete
Reason: Add macros from B.6.2, B.6.3
Reason: Add macros from B.6.2, B.6.3
[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 */