# sin(), sinf(), sinl()

Calculate the sine of an angle

## Synopsis:

```#include <math.h>

double sin( double x );

float sinf( float x );

long double sinl( long double x );
```

## Arguments:

x
The angle, in radians, for which you want to compute the sine.

## Library:

libm

Use the -l m option to qcc to link against this library.

## Description:

These functions compute the sine of x radians. An argument with a large magnitude may yield a result with little or no significance.

To check for error situations, use feclearexcept() and fetestexcept(). For example:

• Call feclearexcept(FE_ALL_EXCEPT) before calling sin(), sinf(), or sinl().
• On return, if fetestexcept(FE_ALL_EXCEPT) is nonzero, then an error has occurred.

## Returns:

The sine value, in the range [-1, +1].

If x is: These functions return: Errors:
±0.0 x
±Inf NaN FE_INVALID
NaN x
Subnormal x FE_UNDERFLOW

These functions raise FE_INEXACT if the FPU reports that the result can't be exactly represented as a floating-point number.

## Examples:

```#include <stdio.h>
#include <math.h>
#include <fenv.h>
#include <stdlib.h>

int main( void )
{
int except_flags;

feclearexcept(FE_ALL_EXCEPT);

printf( "%f\n", sin(.5) );

except_flags = fetestexcept(FE_ALL_EXCEPT);
if(except_flags) {
/* An error occurred; handle it appropriately. */
}

return EXIT_SUCCESS;
}
```

produces the output:

```0.479426
```

## Classification:

Safety:
Cancellation point No
Interrupt handler No
Signal handler No