вернуть следующее число с плавающей запятой в сторону положительной / отрицательной бесконечности (return next floating-point number toward positive/negative infinity)
Имя (Name)
nextup, nextupf, nextupl, nextdown, nextdownf, nextdownl - return
next floating-point number toward positive/negative infinity
Синопсис (Synopsis)
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <math.h>
double nextup(double x);
float nextupf(float x);
long double nextupl(long double x);
double nextdown(double x);
float nextdownf(float x);
long double nextdownl(long double x);
Link with -lm.
Описание (Description)
The nextup(), nextupf(), and nextupl() functions return the next
representable floating-point number greater than x.
If x is the smallest representable negative number in the
corresponding type, these functions return -0. If x is 0, the
returned value is the smallest representable positive number of
the corresponding type.
If x is positive infinity, the returned value is positive
infinity. If x is negative infinity, the returned value is the
largest representable finite negative number of the corresponding
type.
If x is Nan, the returned value is NaN.
The value returned by nextdown(x) is -nextup(-x), and similarly
for the other types.
Возвращаемое значение (Return value)
See DESCRIPTION.
Версии (Versions)
These functions first appeared in glibc in version 2.24.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│nextup(), nextupf(), nextupl(), │ Thread safety │ MT-Safe │
│nextdown(), nextdownf(), nextdownl() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
These functions are described in IEEE Std 754-2008 - Standard for
Floating-Point Arithmetic and ISO/IEC TS 18661.
Смотри также (See also)
nearbyint(3), nextafter(3)
