exp2(3) — Linux manual pages

Linux manual pages	Section 3: Subroutines

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);

Note

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`

	Note
	Link with `−lm`.

DESCRIPTION

The exp2() function returns 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.

CONFORMING TO

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

COLOPHON

This page is part of release 3.52 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/.

  Copyright 1993 David Metcalfe (davidprism.demon.co.uk)
and Copyright 2008, Linux Foundation, written by Michael Kerrisk
    <mtk.manpagesgmail.com>

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References consulted:
    Linux libc source code
    Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
    386BSD man pages
Modified 1993-07-24 by Rik Faith (faithcs.unc.edu)
Modified 1995-08-14 by Arnt Gulbrandsen <agulbratroll.no>
Modified 2002-07-27 by Walter Harms
(walter.harmsinformatik.uni-oldenburg.de)