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)

                                                                               2021-03-22                                                                        EXP2(3)