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a1eaacb1 | 1 | '\" t |
fea681da | 2 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
b2de3fac MK |
3 | .\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk |
4 | .\" <mtk.manpages@gmail.com> | |
fea681da | 5 | .\" |
5fbde956 | 6 | .\" SPDX-License-Identifier: Linux-man-pages-copyleft |
fea681da MK |
7 | .\" |
8 | .\" References consulted: | |
9 | .\" Linux libc source code | |
10 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
11 | .\" 386BSD man pages | |
12 | .\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu) | |
13 | .\" Modified 1995-08-14 by Arnt Gulbrandsen <agulbra@troll.no> | |
14 | .\" Modified 2002-07-27 by Walter Harms | |
15 | .\" (walter.harms@informatik.uni-oldenburg.de) | |
16 | .\" | |
4c1c5274 | 17 | .TH log10 3 (date) "Linux man-pages (unreleased)" |
fea681da MK |
18 | .SH NAME |
19 | log10, log10f, log10l \- base-10 logarithmic function | |
6f258d4c AC |
20 | .SH LIBRARY |
21 | Math library | |
8fc3b2cf | 22 | .RI ( libm ", " \-lm ) |
fea681da MK |
23 | .SH SYNOPSIS |
24 | .nf | |
25 | .B #include <math.h> | |
c6d039a3 | 26 | .P |
fea681da | 27 | .BI "double log10(double " x ); |
fea681da | 28 | .BI "float log10f(float " x ); |
fea681da MK |
29 | .BI "long double log10l(long double " x ); |
30 | .fi | |
c6d039a3 | 31 | .P |
d39ad78f | 32 | .RS -4 |
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33 | Feature Test Macro Requirements for glibc (see |
34 | .BR feature_test_macros (7)): | |
d39ad78f | 35 | .RE |
c6d039a3 | 36 | .P |
b2de3fac MK |
37 | .BR log10f (), |
38 | .BR log10l (): | |
9d2adbae | 39 | .nf |
5c10d2c5 | 40 | _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L |
9d2adbae | 41 | || /* Since glibc 2.19: */ _DEFAULT_SOURCE |
75c018a1 | 42 | || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE |
9d2adbae | 43 | .fi |
fea681da | 44 | .SH DESCRIPTION |
6da06e35 | 45 | These functions return the base-10 logarithm of |
022671eb | 46 | .IR x . |
b2de3fac | 47 | .SH RETURN VALUE |
6da06e35 | 48 | On success, these functions return the base-10 logarithm of |
b2de3fac | 49 | .IR x . |
c6d039a3 | 50 | .P |
b2de3fac MK |
51 | For special cases, including where |
52 | .I x | |
53 | is 0, 1, negative, infinity, or NaN, see | |
54 | .BR log (3). | |
fea681da | 55 | .SH ERRORS |
b2de3fac MK |
56 | See |
57 | .BR math_error (7) | |
58 | for information on how to determine whether an error has occurred | |
59 | when calling these functions. | |
c6d039a3 | 60 | .P |
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61 | For a discussion of the errors that can occur for these functions, see |
62 | .BR log (3). | |
acbba9e3 MS |
63 | .SH ATTRIBUTES |
64 | For an explanation of the terms used in this section, see | |
65 | .BR attributes (7). | |
66 | .TS | |
67 | allbox; | |
c466875e | 68 | lbx lb lb |
acbba9e3 MS |
69 | l l l. |
70 | Interface Attribute Value | |
71 | T{ | |
9e54434e BR |
72 | .na |
73 | .nh | |
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74 | .BR log10 (), |
75 | .BR log10f (), | |
76 | .BR log10l () | |
77 | T} Thread safety MT-Safe | |
78 | .TE | |
3113c7f3 | 79 | .SH STANDARDS |
4131356c AC |
80 | C11, POSIX.1-2008. |
81 | .SH HISTORY | |
82 | C99, POSIX.1-2001. | |
c6d039a3 | 83 | .P |
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84 | The variant returning |
85 | .I double | |
86 | also conforms to | |
e0089d55 | 87 | SVr4, 4.3BSD, C89. |
47297adb | 88 | .SH SEE ALSO |
fea681da | 89 | .BR cbrt (3), |
36268806 | 90 | .BR clog10 (3), |
0912b48d | 91 | .BR exp10 (3), |
be62f421 JE |
92 | .BR log (3), |
93 | .BR log2 (3), | |
fea681da | 94 | .BR sqrt (3) |