float sinf( float arg );
(1) (since C99)double sin( double arg );
(2)long double sinl( long double arg );
(3) (since C99)_Decimal32 sind32( _Decimal32 arg );
(4) (since C23)_Decimal64 sind64( _Decimal64 arg );
(5) (since C23)_Decimal128 sind128( _Decimal128 arg );
(6) (since C23)#define sin( arg )
(7) (since C99)1-3) Computes the sine of arg (measured in radians).
7)Type-generic macro: If the argument has type
long double,
(3)(
sinl
) is called. Otherwise, if the argument has integer type or the type
double,
(2)(
sin
) is called. Otherwise,
(1)(
sinf
) is called. If the argument is complex, then the macro invokes the corresponding complex function (
csinl,
csin,
csinf).
The functions (4-6) are declared if and only if the implementation predefines __STDC_IEC_60559_DFP__ (i.e. the implementation supports decimal floating-point numbers).
If no errors occur, the sine of arg (sin(arg)) in the range [-1 ; +1], is returned.
The result may have little or no significance if the magnitude of arg is large.
(until C99)If a domain error occurs, an implementation-defined value is returned (NaN where supported).
If a range error occurs due to underflow, the correct result (after rounding) is returned.
[edit] Error handlingErrors are reported as specified in math_errhandling.
If the implementation supports IEEE floating-point arithmetic (IEC 60559):
The case where the argument is infinite is not specified to be a domain error in C, but it is defined as a domain error in POSIX.
POSIX also specifies that in case of underflow, arg is returned unmodified, and if that is not supported, an implementation-defined value no greater than DBL_MIN, FLT_MIN, and LDBL_MIN is returned.
[edit] Example#include <errno.h>
#include <fenv.h>
#include <math.h>
#include <stdio.h>
#ifndef __GNUC__
#pragma STDC FENV_ACCESS ON
#endif
int main(void)
{
const double pi = acos(-1);
// typical usage
printf("sin(pi/6) = %f\n", sin(pi / 6));
printf("sin(pi/2) = %f\n", sin(pi / 2));
printf("sin(-3*pi/4) = %f\n", sin(-3 * pi / 4));
// special values
printf("sin(+0) = %f\n", sin(0.0));
printf("sin(-0) = %f\n", sin(-0.0));
// error handling
feclearexcept(FE_ALL_EXCEPT);
printf("sin(INFINITY) = %f\n", sin(INFINITY));
if (fetestexcept(FE_INVALID))
puts(" FE_INVALID raised");
}
Possible output:
sin(pi/6) = 0.500000
sin(pi/2) = 1.000000
sin(-3*pi/4) = -0.707107
sin(+0) = 0.000000
sin(-0) = -0.000000
sin(INFINITY) = -nan
FE_INVALID raised[edit] References
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