cfloat
这个标头最初在C标准库中作为<float.h>...
此标头是类型支撑库的%27s部分。C数字限制接口...
宏
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) |
简介
二次
#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*/二次
? cppreference.com在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。
本文档系腾讯云开发者社区成员共同维护，如有问题请联系 cloudcommunity@tencent.com
