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fea681da | 1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
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2 | .\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk |
3 | .\" <mtk.manpages@gmail.com> | |
fea681da | 4 | .\" |
93015253 | 5 | .\" %%%LICENSE_START(VERBATIM) |
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6 | .\" Permission is granted to make and distribute verbatim copies of this |
7 | .\" manual provided the copyright notice and this permission notice are | |
8 | .\" preserved on all copies. | |
9 | .\" | |
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. | |
c13182ef | 14 | .\" |
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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16 | .\" manual page may be incorrect or out-of-date.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 | |
21 | .\" professionally. | |
c13182ef | 22 | .\" |
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23 | .\" Formatted or processed versions of this manual, if unaccompanied by |
24 | .\" the source, must acknowledge the copyright and authors of this work. | |
4b72fb64 | 25 | .\" %%%LICENSE_END |
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26 | .\" |
27 | .\" References consulted: | |
28 | .\" Linux libc source code | |
29 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
30 | .\" 386BSD man pages | |
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) | |
35 | .\" | |
4b8c67d9 | 36 | .TH EXP2 3 2017-09-15 "" "Linux Programmer's Manual" |
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37 | .SH NAME |
38 | exp2, exp2f, exp2l \- base-2 exponential function | |
39 | .SH SYNOPSIS | |
40 | .nf | |
41 | .B #include <math.h> | |
68e4db0a | 42 | .PP |
fea681da | 43 | .BI "double exp2(double " x ); |
fea681da | 44 | .BI "float exp2f(float " x ); |
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45 | .BI "long double exp2l(long double " x ); |
46 | .fi | |
68e4db0a | 47 | .PP |
cc4615cc | 48 | Link with \fI\-lm\fP. |
68e4db0a | 49 | .PP |
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50 | .in -4n |
51 | Feature Test Macro Requirements for glibc (see | |
52 | .BR feature_test_macros (7)): | |
53 | .in | |
68e4db0a | 54 | .PP |
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55 | .ad l |
56 | .BR exp2 (), | |
57 | .BR exp2f (), | |
58 | .BR exp2l (): | |
f10428d9 | 59 | .RS 4 |
cd2d5ec1 | 60 | _ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L |
f10428d9 | 61 | .RE |
cc4615cc | 62 | .ad b |
fea681da | 63 | .SH DESCRIPTION |
5600f73a | 64 | These functions return the value of 2 raised to the power of |
022671eb | 65 | .IR x . |
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66 | .SH RETURN VALUE |
67 | On success, these functions return the base-2 exponential value of | |
68 | .IR x . | |
847e0d88 | 69 | .PP |
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70 | For various special cases, including the handling of infinity and NaN, |
71 | as well as overflows and underflows, see | |
72 | .BR exp (3). | |
73 | .SH ERRORS | |
74 | See | |
75 | .BR math_error (7) | |
76 | for information on how to determine whether an error has occurred | |
77 | when calling these functions. | |
847e0d88 | 78 | .PP |
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79 | For a discussion of the errors that can occur for these functions, see |
80 | .BR exp (3). | |
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81 | .SH VERSIONS |
82 | These functions first appeared in glibc in version 2.1. | |
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83 | .SH ATTRIBUTES |
84 | For an explanation of the terms used in this section, see | |
85 | .BR attributes (7). | |
86 | .TS | |
87 | allbox; | |
88 | lbw24 lb lb | |
89 | l l l. | |
90 | Interface Attribute Value | |
91 | T{ | |
92 | .BR exp2 (), | |
93 | .BR exp2f (), | |
94 | .BR exp2l () | |
95 | T} Thread safety MT-Safe | |
96 | .TE | |
47297adb | 97 | .SH CONFORMING TO |
9a74e018 | 98 | C99, POSIX.1-2001, POSIX.1-2008. |
847e0d88 | 99 | .PP |
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100 | The variant returning |
101 | .I double | |
102 | also conforms to | |
377ec1fd | 103 | SVr4, 4.3BSD. |
47297adb | 104 | .SH SEE ALSO |
fea681da | 105 | .BR cbrt (3), |
36268806 | 106 | .BR cexp2 (3), |
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107 | .BR exp (3), |
108 | .BR exp10 (3), | |
109 | .BR sqrt (3) |