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
12 sin, sinf, sinl — sine function
13
15 #include <math.h>
16 double sin(double x);
18 float sinf(float x);
19 long double sinl(long double x);
20
22 The functionality described on this reference page is aligned with the
23 ISO C standard. Any conflict between the requirements described here
24 and the ISO C standard is unintentional. This volume of POSIX.1‐2017
25 defers to the ISO C standard.
26 These functions shall compute the sine of their argument x, measured in
28 radians.
29 An application wishing to check for error situations should set errno
31 to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these
32 functions. On return, if errno is non-zero or fetestexcept(FE_INVALID |
33 FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has
34 occurred.
35
37 Upon successful completion, these functions shall return the sine of x.
38 If x is NaN, a NaN shall be returned.
40 If x is ±0, x shall be returned.
42 If x is subnormal, a range error may occur
44 and x should be returned.
45 If x is not returned, sin(), sinf(), and sinl() shall return an imple‐
47 mentation-defined value no greater in magnitude than DBL_MIN, FLT_MIN,
48 and LDBL_MIN, respectively.
49 If x is ±Inf, a domain error shall occur, and a NaN shall be returned.
51
53 These functions shall fail if:
54 Domain Error
56 The x argument is ±Inf.
57 If the integer expression (math_errhandling & MATH_ERRNO)
59 is non-zero, then errno shall be set to [EDOM]. If the
60 integer expression (math_errhandling & MATH_ERREXCEPT) is
61 non-zero, then the invalid floating-point exception shall
62 be raised.
63 These functions may fail if:
65 Range Error The value of x is subnormal
67 If the integer expression (math_errhandling & MATH_ERRNO)
69 is non-zero, then errno shall be set to [ERANGE]. If the
70 integer expression (math_errhandling & MATH_ERREXCEPT) is
71 non-zero, then the underflow floating-point exception shall
72 be raised.
73 The following sections are informative.
75
77 Taking the Sine of a 45-Degree Angle
78 #include <math.h>
79 ...
80 double radians = 45.0 * M_PI / 180;
81 double result;
82 ...
83 result = sin(radians);
84
86 These functions may lose accuracy when their argument is near a multi‐
87 ple of π or is far from 0.0.
88 On error, the expressions (math_errhandling & MATH_ERRNO) and
90 (math_errhandling & MATH_ERREXCEPT) are independent of each other, but
91 at least one of them must be non-zero.
92
94 None.
95
97 None.
98
100 asin(), feclearexcept(), fetestexcept(), isnan()
101 The Base Definitions volume of POSIX.1‐2017, Section 4.20, Treatment of
103 Error Conditions for Mathematical Functions, <math.h>
104
106 Portions of this text are reprinted and reproduced in electronic form
107 from IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
108 table Operating System Interface (POSIX), The Open Group Base Specifi‐
109 cations Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of
110 Electrical and Electronics Engineers, Inc and The Open Group. In the
111 event of any discrepancy between this version and the original IEEE and
112 The Open Group Standard, the original IEEE and The Open Group Standard
113 is the referee document. The original Standard can be obtained online
114 at http://www.opengroup.org/unix/online.html .
115 Any typographical or formatting errors that appear in this page are
117 most likely to have been introduced during the conversion of the source
118 files to man page format. To report such errors, see https://www.ker‐
119 nel.org/doc/man-pages/reporting_bugs.html .
120IEEE/The Open Group 2017 SIN(3P)