projects / thirdparty / man-pages.git / blame
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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 | .\" |
| 5fbde956 | 5 | .\" SPDX-License-Identifier: Linux-man-pages-copyleft |
| fea681da MK |
6 | .\" |
| 7 | .\" References consulted: | |
| 8 | .\" Linux libc source code | |
| 9 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
| 10 | .\" 386BSD man pages | |
| 11 | .\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu) | |
| 12 | .\" Modified 1995-08-14 by Arnt Gulbrandsen <agulbra@troll.no> | |
| 13 | .\" Modified 2002-07-27 by Walter Harms | |
| 14 | .\" (walter.harms@informatik.uni-oldenburg.de) | |
| 15 | .\" | |
| 7bd6328f | 16 | .TH LOG10 3 2021-03-22 "Linux man-pages (unreleased)" "Linux Programmer's Manual" |
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17 | .SH NAME |
| 18 | log10, log10f, log10l \- base-10 logarithmic function | |
| 6f258d4c AC |
19 | .SH LIBRARY |
| 20 | Math library | |
| 8fc3b2cf | 21 | .RI ( libm ", " \-lm ) |
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22 | .SH SYNOPSIS |
| 23 | .nf | |
| 24 | .B #include <math.h> | |
| 68e4db0a | 25 | .PP |
| fea681da | 26 | .BI "double log10(double " x ); |
| fea681da | 27 | .BI "float log10f(float " x ); |
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28 | .BI "long double log10l(long double " x ); |
| 29 | .fi | |
| 68e4db0a | 30 | .PP |
| d39ad78f | 31 | .RS -4 |
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32 | Feature Test Macro Requirements for glibc (see |
| 33 | .BR feature_test_macros (7)): | |
| d39ad78f | 34 | .RE |
| 68e4db0a | 35 | .PP |
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36 | .BR log10f (), |
| 37 | .BR log10l (): | |
| 9d2adbae | 38 | .nf |
| 5c10d2c5 | 39 | _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L |
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40 | || /* Since glibc 2.19: */ _DEFAULT_SOURCE |
| 41 | || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE | |
| 42 | .fi | |
| fea681da | 43 | .SH DESCRIPTION |
| 5600f73a | 44 | These functions return the base 10 logarithm of |
| 022671eb | 45 | .IR x . |
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46 | .SH RETURN VALUE |
| 47 | On success, these functions return the base 10 logarithm of | |
| 48 | .IR x . | |
| 847e0d88 | 49 | .PP |
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50 | For special cases, including where |
| 51 | .I x | |
| 52 | is 0, 1, negative, infinity, or NaN, see | |
| 53 | .BR log (3). | |
| fea681da | 54 | .SH ERRORS |
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55 | See |
| 56 | .BR math_error (7) | |
| 57 | for information on how to determine whether an error has occurred | |
| 58 | when calling these functions. | |
| 847e0d88 | 59 | .PP |
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60 | For a discussion of the errors that can occur for these functions, see |
| 61 | .BR log (3). | |
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62 | .SH ATTRIBUTES |
| 63 | For an explanation of the terms used in this section, see | |
| 64 | .BR attributes (7). | |
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65 | .ad l |
| 66 | .nh | |
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67 | .TS |
| 68 | allbox; | |
| c466875e | 69 | lbx lb lb |
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70 | l l l. |
| 71 | Interface Attribute Value | |
| 72 | T{ | |
| 73 | .BR log10 (), | |
| 74 | .BR log10f (), | |
| 75 | .BR log10l () | |
| 76 | T} Thread safety MT-Safe | |
| 77 | .TE | |
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78 | .hy |
| 79 | .ad | |
| 80 | .sp 1 | |
| 3113c7f3 | 81 | .SH STANDARDS |
| 9a74e018 | 82 | C99, POSIX.1-2001, POSIX.1-2008. |
| 847e0d88 | 83 | .PP |
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84 | The variant returning |
| 85 | .I double | |
| 86 | also conforms to | |
| 68e1685c | 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), |
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92 | .BR log (3), |
| 93 | .BR log2 (3), | |
| fea681da | 94 | .BR sqrt (3) |