C numeric limits interface

See also std::numeric_limits interface.

Defined in header `<cstdint>`
PTRDIFF_MIN (C++11)	minimum value of object of `std::ptrdiff_t` type (macro constant)
PTRDIFF_MAX (C++11)	maximum value of object of `std::ptrdiff_t` type (macro constant)
SIZE_MAX (C++11)	maximum value of object of `std::size_t` type (macro constant)
SIG_ATOMIC_MIN (C++11)	minimum value of object of `std::sig_atomic_t` type (macro constant)
SIG_ATOMIC_MAX (C++11)	maximum value of object of `std::sig_atomic_t` type (macro constant)
WCHAR_MIN (C++11)	minimum value of object of `wchar_t` type (macro constant)
WCHAR_MAX (C++11)	maximum value of object of `wchar_t` type (macro constant)
WINT_MIN (C++11)	minimum value of object of `std::wint_t` type (macro constant)
WINT_MAX (C++11)	maximum value of object of `std::wint_t` type (macro constant)

Limits of integer types

Defined in header `<climits>`
CHAR_BIT	number of bits in a byte (macro constant)
MB_LEN_MAX	maximum number of bytes in a multibyte character (macro constant)
CHAR_MIN	minimum value of `char` (macro constant)
CHAR_MAX	maximum value of `char` (macro constant)
SCHAR_MINSHRT_MININT_MINLONG_MINLLONG_MIN (C++11)	minimum value of `signed char`, `short`, `int`, `long` and `long long` respectively (macro constant)
SCHAR_MAXSHRT_MAXINT_MAXLONG_MAXLLONG_MAX (C++11)	maximum value of `signed char`, `short`, `int`, `long` and `long long` respectively (macro constant)
UCHAR_MAXUSHRT_MAXUINT_MAXULONG_MAXULLONG_MAX (C++11)	maximum value of `unsigned char`, `unsigned short`, `unsigned int`, `unsigned long` and `unsigned long long` respectively (macro constant)

Note: the types of these constants, other than CHAR_BIT and MB_LEN_MAX, are required to match the results of the integral promotions as applied to objects of the types they describe: CHAR_MAX may have type int or unsigned int, but never char. Similarly USHRT_MAX may not be of an unsigned type: its type may be int.

Limits of floating point types

Defined in header `<cfloat>`
FLT_RADIX	the radix (integer base) used by the representation of all three floating-point types (macro constant)
DECIMAL_DIG (C++11)	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` (see also `std::numeric_limits::max_digits10`) (macro constant)
FLT_DECIMAL_DIGDBL_DECIMAL_DIGLDBL_DECIMAL_DIG (C++17)	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 (see also `std::numeric_limits::max_digits10`). Defined to at least 6, 10, and 10 respectively, or 9 for IEEE float and 17 for IEEE double. (macro constant)
FLT_MINDBL_MINLDBL_MIN	minimum normalized positive value of `float`, `double` and `long double` respectively (macro constant)
FLT_TRUE_MINDBL_TRUE_MINLDBL_TRUE_MIN (C++17)	minimum positive value of `float`, `double` and `long double` respectively (macro constant)
FLT_MAXDBL_MAXLDBL_MAX	maximum value of `float`, `double` and `long double` respectively (macro constant)
FLT_EPSILONDBL_EPSILONLDBL_EPSILON	difference between `1.0` and the next representable value for `float`, `double` and `long double` respectively (macro constant)
FLT_DIGDBL_DIGLDBL_DIG	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 `std::numeric_limits::digits10` for explanation) (macro constant)
FLT_MANT_DIGDBL_MANT_DIGLDBL_MANT_DIG	number of base `FLT_RADIX` digits 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 by power one less than that integer 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 more than that integer is a normalized `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 by power one more than that integer is a normalized `float`, `double` and `long double` respectively (macro constant)
FLT_ROUNDS	default rounding mode of floating-point arithmetics (macro constant)
FLT_EVAL_METHOD (C++11)	specifies in what precision all arithmetic operations are done (macro constant)
FLT_HAS_SUBNORMDBL_HAS_SUBNORMLDBL_HAS_SUBNORM (C++17)	specifies whether the type supports subnormal (denormal) numbers: -1 indeterminable, 0 absent, 1 present (macro constant)