# sinf(3) [posix man page]

```SIN(P)							     POSIX Programmer's Manual							    SIN(P)

NAME
sin, sinf, sinl - sine function

SYNOPSIS
#include <math.h>

double sin(double x);
float sinf(float x);
long double sinl(long double x);

DESCRIPTION
These functions shall compute the sine of their argument x, measured in radians.

An  application	wishing  to check for error situations should set errno to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these
functions.  On return, if errno is non-zero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero,  an  error
has occurred.

RETURN VALUE
Upon successful completion, these functions shall return the sine of x.

If x is NaN, a NaN shall be returned.

If x is +-0, x shall be returned.

If x is subnormal, a range error may occur and x should be returned.

If x is +-Inf, a domain error shall occur, and either a NaN (if supported), or an implementation-defined value shall be returned.

ERRORS
These functions shall fail if:

Domain Error
The x argument is +-Inf.

If  the	integer  expression  (math_errhandling	&  MATH_ERRNO)	is  non-zero, then errno shall be set to [EDOM]. If the integer expression
(math_errhandling & MATH_ERREXCEPT) is non-zero, then the invalid floating-point exception shall be raised.

These functions may fail if:

Range Error
The value of x is subnormal

If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be set  to  [ERANGE].  If  the  integer	expression
(math_errhandling & MATH_ERREXCEPT) is non-zero, then the underflow floating-point exception shall be raised.

The following sections are informative.

EXAMPLES
Taking the Sine of a 45-Degree Angle
#include <math.h>
...
double radians = 45.0 * M_PI / 180;
double result;
...

APPLICATION USAGE
These functions may lose accuracy when their argument is near a multiple of pi or is far from 0.0.

On  error,  the	expressions  (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are independent of each other, but at
least one of them must be non-zero.

RATIONALE
None.

FUTURE DIRECTIONS
None.

asin() , feclearexcept() , fetestexcept() , isnan() , the Base Definitions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error
Conditions for Mathematical Functions, <math.h>

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical  and	Electronics  Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can  be  obtained
online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group						       2003								    SIN(P)```

## Check Out this Related Man Page

```SIN(3P) 						     POSIX Programmer's Manual							   SIN(3P)

PROLOG
This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME
sin, sinf, sinl - sine function

SYNOPSIS
#include <math.h>

double sin(double x);
float sinf(float x);
long double sinl(long double x);

DESCRIPTION
These functions shall compute the sine of their argument x, measured in radians.

An application wishing to check for error situations should set errno to zero and call feclearexcept(FE_ALL_EXCEPT)  before  calling  these
functions.   On	return, if errno is non-zero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error
has occurred.

RETURN VALUE
Upon successful completion, these functions shall return the sine of x.

If x is NaN, a NaN shall be returned.

If x is +-0, x shall be returned.

If x is subnormal, a range error may occur and x should be returned.

If x is +-Inf, a domain error shall occur, and either a NaN (if supported), or an implementation-defined value shall be returned.

ERRORS
These functions shall fail if:

Domain Error
The x argument is +-Inf.

If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall	be  set  to  [EDOM].  If  the  integer	expression
(math_errhandling & MATH_ERREXCEPT) is non-zero, then the invalid floating-point exception shall be raised.

These functions may fail if:

Range Error
The value of x is subnormal

If  the	integer  expression  (math_errhandling	&  MATH_ERRNO) is non-zero, then errno shall be set to [ERANGE]. If the integer expression
(math_errhandling & MATH_ERREXCEPT) is non-zero, then the underflow floating-point exception shall be raised.

The following sections are informative.

EXAMPLES
Taking the Sine of a 45-Degree Angle
#include <math.h>
...
double radians = 45.0 * M_PI / 180;
double result;
...

APPLICATION USAGE
These functions may lose accuracy when their argument is near a multiple of pi or is far from 0.0.

On error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are independent of  each  other,  but	at
least one of them must be non-zero.

RATIONALE
None.

FUTURE DIRECTIONS
None.