1REMAINDER(3P) POSIX Programmer's Manual REMAINDER(3P)
2
6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
10
13 remainder, remainderf, remainderl — remainder function
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16 #include <math.h>
17 double remainder(double x, double y);
19 float remainderf(float x, float y);
20 long double remainderl(long double x, long double y);
21
23 The functionality described on this reference page is aligned with the
24 ISO C standard. Any conflict between the requirements described here
25 and the ISO C standard is unintentional. This volume of POSIX.1‐2008
26 defers to the ISO C standard.
27 These functions shall return the floating-point remainder r=x−ny when y
29 is non-zero. The value n is the integral value nearest the exact value
30 x/y. When |n−x/y|=½, the value n is chosen to be even.
31 The behavior of remainder() shall be independent of the rounding mode.
33
35 Upon successful completion, these functions shall return the floating-
36 point remainder r=x−ny when y is non-zero.
37 On systems that do not support the IEC 60559 Floating-Point option, if
39 y is zero, it is implementation-defined whether a domain error occurs
40 or zero is returned.
41 If x or y is NaN, a NaN shall be returned.
43 If x is infinite or y is 0 and the other is non-NaN, a domain error
45 shall occur, and a NaN shall be returned.
46
48 These functions shall fail if:
49 Domain Error
51 The x argument is ±Inf, or the y argument is ±0 and the
52 other argument is non-NaN.
53 If the integer expression (math_errhandling & MATH_ERRNO)
55 is non-zero, then errno shall be set to [EDOM]. If the
56 integer expression (math_errhandling & MATH_ERREXCEPT) is
57 non-zero, then the invalid floating-point exception shall
58 be raised.
59 These functions may fail if:
61 Domain Error
63 The y argument is zero.
64 If the integer expression (math_errhandling & MATH_ERRNO)
66 is non-zero, then errno shall be set to [EDOM]. If the
67 integer expression (math_errhandling & MATH_ERREXCEPT) is
68 non-zero, then the invalid floating-point exception shall
69 be raised.
70 The following sections are informative.
72
74 None.
75
77 On error, the expressions (math_errhandling & MATH_ERRNO) and
78 (math_errhandling & MATH_ERREXCEPT) are independent of each other, but
79 at least one of them must be non-zero.
80
82 None.
83
85 None.
86
88 abs(), div(), feclearexcept(), fetestexcept(), ldiv()
89 The Base Definitions volume of POSIX.1‐2008, Section 4.19, Treatment of
91 Error Conditions for Mathematical Functions, <math.h>
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94 Portions of this text are reprinted and reproduced in electronic form
95 from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
96 -- Portable Operating System Interface (POSIX), The Open Group Base
97 Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
98 cal and Electronics Engineers, Inc and The Open Group. (This is
99 POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
100 event of any discrepancy between this version and the original IEEE and
101 The Open Group Standard, the original IEEE and The Open Group Standard
102 is the referee document. The original Standard can be obtained online
103 at http://www.unix.org/online.html .
104 Any typographical or formatting errors that appear in this page are
106 most likely to have been introduced during the conversion of the source
107 files to man page format. To report such errors, see https://www.ker‐
108 nel.org/doc/man-pages/reporting_bugs.html .
109IEEE/The Open Group 2013 REMAINDER(3P)