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1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| 2 | .\" | |
| 93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
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4 | .\" Permission is granted to make and distribute verbatim copies of this |
| 5 | .\" manual provided the copyright notice and this permission notice are | |
| 6 | .\" preserved on all copies. | |
| 7 | .\" | |
| 8 | .\" Permission is granted to copy and distribute modified versions of this | |
| 9 | .\" manual under the conditions for verbatim copying, provided that the | |
| 10 | .\" entire resulting derived work is distributed under the terms of a | |
| 11 | .\" permission notice identical to this one. | |
| c13182ef | 12 | .\" |
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13 | .\" Since the Linux kernel and libraries are constantly changing, this |
| 14 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 15 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 16 | .\" the use of the information contained herein. The author(s) may not | |
| 17 | .\" have taken the same level of care in the production of this manual, | |
| 18 | .\" which is licensed free of charge, as they might when working | |
| 19 | .\" professionally. | |
| c13182ef | 20 | .\" |
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21 | .\" Formatted or processed versions of this manual, if unaccompanied by |
| 22 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 4b72fb64 | 23 | .\" %%%LICENSE_END |
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24 | .\" |
| 25 | .\" References consulted: | |
| 26 | .\" Linux libc source code | |
| 27 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
| 28 | .\" 386BSD man pages | |
| 29 | .\" Modified Sat Jul 24 19:42:04 1993 by Rik Faith (faith@cs.unc.edu) | |
| 30 | .\" Added fabsl, fabsf, aeb, 2001-06-07 | |
| 31 | .\" | |
| 50831f9b | 32 | .TH FABS 3 2010-09-20 "" "Linux Programmer's Manual" |
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33 | .SH NAME |
| 34 | fabs, fabsf, fabsl \- absolute value of floating-point number | |
| 35 | .SH SYNOPSIS | |
| 36 | .nf | |
| 37 | .B #include <math.h> | |
| 38 | .sp | |
| 39 | .BI "double fabs(double " x ); | |
| 40 | .br | |
| 41 | .BI "float fabsf(float " x ); | |
| 42 | .br | |
| 43 | .BI "long double fabsl(long double " x ); | |
| 44 | .fi | |
| 45 | .sp | |
| 20c58d70 | 46 | Link with \fI\-lm\fP. |
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47 | .sp |
| 48 | .in -4n | |
| 49 | Feature Test Macro Requirements for glibc (see | |
| 50 | .BR feature_test_macros (7)): | |
| 51 | .in | |
| 52 | .sp | |
| 53 | .ad l | |
| 54 | .BR fabsf (), | |
| 55 | .BR fabsl (): | |
| 2c3ae4cd | 56 | .RS 4 |
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57 | _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE || |
| 58 | _POSIX_C_SOURCE\ >=\ 200112L; | |
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59 | .br |
| 60 | or | |
| 824eec7e | 61 | .I cc\ -std=c99 |
| 2c3ae4cd | 62 | .RE |
| 824eec7e | 63 | .ad b |
| fea681da | 64 | .SH DESCRIPTION |
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65 | The |
| 66 | .BR fabs () | |
| 67 | functions return the absolute value of the floating-point | |
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68 | number |
| 69 | .IR x . | |
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70 | .SH RETURN VALUE |
| 71 | These functions return the absolute value of | |
| 72 | .IR x . | |
| 73 | ||
| 74 | If | |
| 75 | .I x | |
| 76 | is a NaN, a NaN is returned. | |
| 77 | ||
| 78 | If | |
| 79 | .I x | |
| 80 | is \-0, +0 is returned. | |
| 81 | ||
| 82 | If | |
| 83 | .I x | |
| 84 | is negative infinity or positive infinity, positive infinity is returned. | |
| fea681da | 85 | .SH ERRORS |
| 824eec7e | 86 | No errors occur. |
| 47297adb | 87 | .SH CONFORMING TO |
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88 | C99, POSIX.1-2001. |
| 89 | The variant returning | |
| 90 | .I double | |
| 91 | also conforms to | |
| 92 | SVr4, 4.3BSD, C89. | |
| 47297adb | 93 | .SH SEE ALSO |
| fea681da | 94 | .BR abs (3), |
| 36268806 | 95 | .BR cabs (3), |
| f0c34053 | 96 | .BR ceil (3), |
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97 | .BR floor (3), |
| 98 | .BR labs (3), | |
| 99 | .BR rint (3) |