exp2(3) | Library Functions Manual | exp2(3) |
NAME
exp2, exp2f, exp2l - base-2 exponential function
LIBRARY
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 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).
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value |
exp2 (), exp2f (), exp2l () | 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.
SEE ALSO
2024-05-02 | Linux man-pages 6.9.1 |