1SIN(3P)                    POSIX Programmer's Manual                   SIN(3P)
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PROLOG

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.
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11

NAME

13       sin, sinf, sinl — sine function
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SYNOPSIS

16       #include <math.h>
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18       double sin(double x);
19       float sinf(float x);
20       long double sinl(long double x);
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DESCRIPTION

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.
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28       These functions shall compute the sine of their argument x, measured in
29       radians.
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31       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.
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RETURN VALUE

38       Upon successful completion, these functions shall return the sine of x.
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40       If x is NaN, a NaN shall be returned.
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42       If x is ±0, x shall be returned.
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44       If x is subnormal, a range error may occur
45       and x should be returned.
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47       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.
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51       If x is ±Inf, a domain error shall occur, and a NaN shall be returned.
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ERRORS

54       These functions shall fail if:
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56       Domain Error
57                   The x argument is ±Inf.
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59                   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.
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65       These functions may fail if:
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67       Range Error The value of x is subnormal
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69                   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.
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75       The following sections are informative.
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EXAMPLES

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);
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APPLICATION USAGE

87       These functions may lose accuracy when their argument is near a  multi‐
88       ple of π or is far from 0.0.
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90       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.
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RATIONALE

95       None.
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FUTURE DIRECTIONS

98       None.
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SEE ALSO

101       asin(), feclearexcept(), fetestexcept(), isnan()
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103       The Base Definitions volume of POSIX.1‐2008, Section 4.19, Treatment of
104       Error Conditions for Mathematical Functions, <math.h>
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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 .
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118       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 .
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125IEEE/The Open Group                  2013                              SIN(3P)
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