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():
           _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
           or cc -std=c99

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, C89.

SEE ALSO

       cbrt(3), cexp2(3), exp(3), exp10(3), sqrt(3)

COLOPHON

       This  page  is  part of release 4.04 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 http://www.kernel.org/doc/man-pages/.

                                            2015-04-19                                    EXP2(3)