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

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       https://www.kernel.org/doc/man-pages/.

                                                   2017-09-15                                            EXP2(3)