Name
exp2, exp2f, exp2l - base-2 exponential functionLibrary
Math library ( libm ", " -lm )Synopsis
#include <math.h> double exp2(double x );
float exp2f(float x );
long double exp2l(long double x );
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 ofx
. Return Value
On success, these functions return the base-2 exponential value ofx
. 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).
Attributes
For an explanation of the terms used in this section, see attributes(7).Interface | Attribute | Value |
T} | Thread safety | MT-Safe |
Standards
C11, POSIX.1-2008.History
glibc 2.1. C99, POSIX.1-2001.The variant returning double also conforms to SVr4, 4.3BSD.