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
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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16 .\" manual page may be incorrect or out-of-date.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
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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 EXP 3 2017-09-15 "" "Linux Programmer's Manual"
38 exp, expf, expl \- base-e exponential function
43 .BI "double exp(double " x );
44 .BI "float expf(float " x );
45 .BI "long double expl(long double " x );
51 Feature Test Macro Requirements for glibc (see
52 .BR feature_test_macros (7)):
59 _ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
60 || /* Since glibc 2.19: */ _DEFAULT_SOURCE
61 || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
65 These functions return the value of e (the base of natural
66 logarithms) raised to the power of
69 On success, these functions return the exponential value of
80 positive infinity is returned.
87 If the result underflows,
91 If the result overflows,
93 and the functions return
102 for information on how to determine whether an error has occurred
103 when calling these functions.
105 The following errors can occur:
107 Range error, overflow
111 An overflow floating-point exception
115 Range error, underflow
119 An underflow floating-point exception
123 For an explanation of the terms used in this section, see
129 Interface Attribute Value
134 T} Thread safety MT-Safe
137 C99, POSIX.1-2001, POSIX.1-2008.
139 The variant returning