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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14 | .\" manual page may be incorrect or out-of-date.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 1993-07-24 by Rik Faith (faith@cs.unc.edu) | |
30 | .\" Modified 2002-07-27 by Walter Harms | |
31 | .\" (walter.harms@informatik.uni-oldenburg.de) | |
32 | .\" | |
fe0fefbf | 33 | .TH MODF 3 2015-03-02 "" "Linux Programmer's Manual" |
fea681da | 34 | .SH NAME |
c13182ef | 35 | modf, modff, modfl \- extract signed integral and fractional values from |
35478399 | 36 | floating-point number |
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37 | .SH SYNOPSIS |
38 | .nf | |
39 | .B #include <math.h> | |
40 | .sp | |
41 | .BI "double modf(double " x ", double *" iptr ); | |
d39541ec | 42 | .br |
fea681da | 43 | .BI "float modff(float " x ", float *" iptr ); |
d39541ec | 44 | .br |
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45 | .BI "long double modfl(long double " x ", long double *" iptr ); |
46 | .fi | |
47 | .sp | |
20c58d70 | 48 | Link with \fI\-lm\fP. |
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49 | .sp |
50 | .in -4n | |
51 | Feature Test Macro Requirements for glibc (see | |
52 | .BR feature_test_macros (7)): | |
53 | .in | |
54 | .sp | |
55 | .ad l | |
56 | .BR modf (), | |
705b3a5c | 57 | .BR modfl (): |
b90c43a8 | 58 | .RS 4 |
8b0d34e4 MK |
59 | _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE || |
60 | _POSIX_C_SOURCE\ >=\ 200112L; | |
b90c43a8 MK |
61 | .br |
62 | or | |
43595898 | 63 | .I cc\ -std=c99 |
b90c43a8 MK |
64 | .RE |
65 | .ad | |
fea681da | 66 | .SH DESCRIPTION |
5600f73a | 67 | These functions break the argument |
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68 | .I x |
69 | into an integral | |
70 | part and a fractional part, each of which has the same sign as | |
71 | .IR x . | |
72 | The integral part is stored in the location pointed to by | |
73 | .IR iptr . | |
47297adb | 74 | .SH RETURN VALUE |
5600f73a | 75 | These functions return the fractional part of |
022671eb | 76 | .IR x . |
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77 | |
78 | If | |
79 | .I x | |
80 | is a NaN, a NaN is returned, and | |
385cf745 | 81 | .IR *iptr |
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82 | is set to a NaN. |
83 | ||
84 | If | |
85 | .I x | |
c3074d70 | 86 | is positive infinity (negative infinity), +0 (\-0) is returned, and |
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87 | .IR *iptr |
88 | is set to positive infinity (negative infinity). | |
89 | .SH ERRORS | |
90 | No errors occur. | |
90703696 | 91 | .SH ATTRIBUTES |
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92 | For an explanation of the terms used in this section, see |
93 | .BR attributes (7). | |
94 | .TS | |
95 | allbox; | |
96 | lbw24 lb lb | |
97 | l l l. | |
98 | Interface Attribute Value | |
99 | T{ | |
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100 | .BR modf (), |
101 | .BR modff (), | |
90703696 | 102 | .BR modfl () |
d55e5801 PH |
103 | T} Thread safety MT-Safe |
104 | .TE | |
47297adb | 105 | .SH CONFORMING TO |
9a74e018 | 106 | C99, POSIX.1-2001, POSIX.1-2008. |
e05e3635 | 107 | |
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108 | The variant returning |
109 | .I double | |
110 | also conforms to | |
68e1685c | 111 | SVr4, 4.3BSD, C89. |
47297adb | 112 | .SH SEE ALSO |
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113 | .BR frexp (3), |
114 | .BR ldexp (3) |