]>
Commit | Line | Data |
---|---|---|
fea681da MK |
1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
2 | .\" | |
93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
fea681da MK |
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 | .\" |
fea681da MK |
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14 | .\" manual page may be incorrect or out-of-date.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 | .\" |
fea681da MK |
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 |
fea681da MK |
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 | .\" | |
4b8c67d9 | 33 | .TH MODF 3 2017-09-15 "" "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 |
fea681da MK |
37 | .SH SYNOPSIS |
38 | .nf | |
39 | .B #include <math.h> | |
68e4db0a | 40 | .PP |
fea681da | 41 | .BI "double modf(double " x ", double *" iptr ); |
fea681da | 42 | .BI "float modff(float " x ", float *" iptr ); |
fea681da MK |
43 | .BI "long double modfl(long double " x ", long double *" iptr ); |
44 | .fi | |
68e4db0a | 45 | .PP |
20c58d70 | 46 | Link with \fI\-lm\fP. |
68e4db0a | 47 | .PP |
43595898 MK |
48 | .in -4n |
49 | Feature Test Macro Requirements for glibc (see | |
50 | .BR feature_test_macros (7)): | |
51 | .in | |
68e4db0a | 52 | .PP |
43595898 MK |
53 | .ad l |
54 | .BR modf (), | |
705b3a5c | 55 | .BR modfl (): |
b90c43a8 | 56 | .RS 4 |
e9d91bcf MK |
57 | _ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L |
58 | || /* Since glibc 2.19: */ _DEFAULT_SOURCE | |
59 | || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE | |
b90c43a8 MK |
60 | .RE |
61 | .ad | |
fea681da | 62 | .SH DESCRIPTION |
5600f73a | 63 | These functions break the argument |
022671eb MK |
64 | .I x |
65 | into an integral | |
66 | part and a fractional part, each of which has the same sign as | |
67 | .IR x . | |
68 | The integral part is stored in the location pointed to by | |
69 | .IR iptr . | |
47297adb | 70 | .SH RETURN VALUE |
5600f73a | 71 | These functions return the fractional part of |
022671eb | 72 | .IR x . |
847e0d88 | 73 | .PP |
43595898 MK |
74 | If |
75 | .I x | |
76 | is a NaN, a NaN is returned, and | |
385cf745 | 77 | .IR *iptr |
43595898 | 78 | is set to a NaN. |
847e0d88 | 79 | .PP |
43595898 MK |
80 | If |
81 | .I x | |
c3074d70 | 82 | is positive infinity (negative infinity), +0 (\-0) is returned, and |
43595898 MK |
83 | .IR *iptr |
84 | is set to positive infinity (negative infinity). | |
85 | .SH ERRORS | |
86 | No errors occur. | |
90703696 | 87 | .SH ATTRIBUTES |
d55e5801 PH |
88 | For an explanation of the terms used in this section, see |
89 | .BR attributes (7). | |
90 | .TS | |
91 | allbox; | |
92 | lbw24 lb lb | |
93 | l l l. | |
94 | Interface Attribute Value | |
95 | T{ | |
90703696 PH |
96 | .BR modf (), |
97 | .BR modff (), | |
90703696 | 98 | .BR modfl () |
d55e5801 PH |
99 | T} Thread safety MT-Safe |
100 | .TE | |
47297adb | 101 | .SH CONFORMING TO |
9a74e018 | 102 | C99, POSIX.1-2001, POSIX.1-2008. |
847e0d88 | 103 | .PP |
43595898 MK |
104 | The variant returning |
105 | .I double | |
106 | also conforms to | |
68e1685c | 107 | SVr4, 4.3BSD, C89. |
47297adb | 108 | .SH SEE ALSO |
fea681da MK |
109 | .BR frexp (3), |
110 | .BR ldexp (3) |