EXP2
Section: Linux Programmer's Manual (3)
Updated: 2017-09-15
Page Index
NAME
exp2, exp2f, exp2l - base-2 exponential function
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
DESCRIPTION
These functions return the value of 2 raised to the power of
x.
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).
ERRORS
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).
VERSIONS
These functions first appeared in glibc in version 2.1.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
exp2(),
exp2f(),
exp2l()
| Thread safety | MT-Safe
|
CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.
The variant returning
double
also conforms to
SVr4, 4.3BSD.
SEE ALSO
cbrt(3),
cexp2(3),
exp(3),
exp10(3),
sqrt(3)
COLOPHON
This page is part of release 5.10 of the Linux
man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
https://www.kernel.org/doc/man-pages/.