экспоненциальная функция с основанием 2 (base-2 exponential function)
Имя (Name)
exp2, exp2f, exp2l - base-2 exponential function
Синопсис (Synopsis)
#include <math.h>
double exp2(double x);
float exp2f(float x);
long double exp2l(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
exp2(), exp2f(), exp2l():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
Описание (Description)
These functions return the value of 2 raised to the power of x.
Возвращаемое значение (Return value)
On success, these functions return the base-2 exponential value
of x.
For various special cases, including the handling of infinity and
NaN, as well as overflows and underflows, see exp(3).
Ошибки (Error)
See math_error(7) for information on how to determine whether an
error has occurred when calling these functions.
For a discussion of the errors that can occur for these
functions, see exp(3).
Версии (Versions)
These functions first appeared in glibc in version 2.1.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│exp2(), exp2f(), exp2l() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
C99, POSIX.1-2001, POSIX.1-2008.
The variant returning double also conforms to SVr4, 4.3BSD.
Смотри также (See also)
cbrt(3), cexp2(3), exp(3), exp10(3), sqrt(3)
