1SIN(3P) POSIX Programmer's Manual SIN(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 sin, sinf, sinl — sine function
14
16 #include <math.h>
17 double sin(double x);
19 float sinf(float x);
20 long double sinl(long double x);
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 compute the sine of their argument x, measured in
29 radians.
30 An application wishing to check for error situations should set errno
32 to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these
33 functions. On return, if errno is non-zero or fetestexcept(FE_INVALID |
34 FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has
35 occurred.
36
38 Upon successful completion, these functions shall return the sine of x.
39 If x is NaN, a NaN shall be returned.
41 If x is ±0, x shall be returned.
43 If x is subnormal, a range error may occur
45 and x should be returned.
46 If x is not returned, sin(), sinf(), and sinl() shall return an imple‐
48 mentation-defined value no greater in magnitude than DBL_MIN, FLT_MIN,
49 and LDBL_MIN, respectively.
50 If x is ±Inf, a domain error shall occur, and a NaN shall be returned.
52
54 These functions shall fail if:
55 Domain Error
57 The x argument is ±Inf.
58 If the integer expression (math_errhandling & MATH_ERRNO)
60 is non-zero, then errno shall be set to [EDOM]. If the
61 integer expression (math_errhandling & MATH_ERREXCEPT) is
62 non-zero, then the invalid floating-point exception shall
63 be raised.
64 These functions may fail if:
66 Range Error The value of x is subnormal
68 If the integer expression (math_errhandling & MATH_ERRNO)
70 is non-zero, then errno shall be set to [ERANGE]. If the
71 integer expression (math_errhandling & MATH_ERREXCEPT) is
72 non-zero, then the underflow floating-point exception shall
73 be raised.
74 The following sections are informative.
76
78 Taking the Sine of a 45-Degree Angle
79 #include <math.h>
80 ...
81 double radians = 45.0 * M_PI / 180;
82 double result;
83 ...
84 result = sin(radians);
85
87 These functions may lose accuracy when their argument is near a multi‐
88 ple of π or is far from 0.0.
89 On error, the expressions (math_errhandling & MATH_ERRNO) and
91 (math_errhandling & MATH_ERREXCEPT) are independent of each other, but
92 at least one of them must be non-zero.
93
95 None.
96
98 None.
99
101 asin(), feclearexcept(), fetestexcept(), isnan()
102 The Base Definitions volume of POSIX.1‐2008, Section 4.19, Treatment of
104 Error Conditions for Mathematical Functions, <math.h>
105
107 Portions of this text are reprinted and reproduced in electronic form
108 from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
109 -- Portable Operating System Interface (POSIX), The Open Group Base
110 Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
111 cal and Electronics Engineers, Inc and The Open Group. (This is
112 POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
113 event of any discrepancy between this version and the original IEEE and
114 The Open Group Standard, the original IEEE and The Open Group Standard
115 is the referee document. The original Standard can be obtained online
116 at http://www.unix.org/online.html .
117 Any typographical or formatting errors that appear in this page are
119 most likely to have been introduced during the conversion of the source
120 files to man page format. To report such errors, see https://www.ker‐
121 nel.org/doc/man-pages/reporting_bugs.html .
122IEEE/The Open Group 2013 SIN(3P)