1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
2 .\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
3 .\" <mtk.manpages@gmail.com>
5 .\" %%%LICENSE_START(VERBATIM)
6 .\" Permission is granted to make and distribute verbatim copies of this
7 .\" manual provided the copyright notice and this permission notice are
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10 .\" Permission is granted to copy and distribute modified versions of this
11 .\" manual under the conditions for verbatim copying, provided that the
12 .\" entire resulting derived work is distributed under the terms of a
13 .\" permission notice identical to this one.
15 .\" Since the Linux kernel and libraries are constantly changing, this
16 .\" manual page may be incorrect or out-of-date. The author(s) assume no
17 .\" responsibility for errors or omissions, or for damages resulting from
18 .\" the use of the information contained herein. The author(s) may not
19 .\" have taken the same level of care in the production of this manual,
20 .\" which is licensed free of charge, as they might when working
23 .\" Formatted or processed versions of this manual, if unaccompanied by
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27 .\" References consulted:
28 .\" Linux libc source code
29 .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
31 .\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
32 .\" Modified 1995-08-14 by Arnt Gulbrandsen <agulbra@troll.no>
33 .\" Modified 2002-07-27 by Walter Harms
34 .\" (walter.harms@informatik.uni-oldenburg.de)
36 .TH EXP2 3 2010-09-20 "" "Linux Programmer's Manual"
38 exp2, exp2f, exp2l \- base-2 exponential function
43 .BI "double exp2(double " x );
45 .BI "float exp2f(float " x );
47 .BI "long double exp2l(long double " x );
53 Feature Test Macro Requirements for glibc (see
54 .BR feature_test_macros (7)):
62 _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L;
71 function returns the value of 2
72 raised to the power of
75 On success, these functions return the base-2 exponential value of
78 For various special cases, including the handling of infinity and NaN,
79 as well as overflows and underflows, see
84 for information on how to determine whether an error has occurred
85 when calling these functions.
87 For a discussion of the errors that can occur for these functions, see
90 These functions first appeared in glibc in version 2.1.
104 This page is part of release 3.67 of the Linux
107 A description of the project,
108 information about reporting bugs,
109 and the latest version of this page,
111 \%http://www.kernel.org/doc/man\-pages/.