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EXP2(3) Linux Programmer's Manual EXP2(3)

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 4.16 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/.

                                2017-09-15                           EXP2(3)