NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | SEE ALSO | COLOPHON

The Linux Programming Interface

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

NAME         top

       exp2, exp2f, exp2l - base-2 exponential function

SYNOPSIS         top

       #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         top

       The exp2() function returns the value of 2 raised to the power of x.

RETURN VALUE         top

       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         top

       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         top

       These functions first appeared in glibc in version 2.1.

CONFORMING TO         top

       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
       4.3BSD, C89.

SEE ALSO         top

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

COLOPHON         top

       This page is part of release 3.32 of the Linux man-pages project.  A
       description of the project, and information about reporting bugs, can be found
       at http://www.kernel.org/doc/man-pages/.

                                      2010-09-20                              EXP2(3)

HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface