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).

VERSIONS

       These functions were added in glibc 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 │
       └───────────────────────────────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       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)