{{keywords>wiki library source code example reference}}
===== sin =====
<code c>
     double sin(double);
</code>
return the sinus

===== C Sourcecode Example =====
compile in linux with: gcc sin.c -o sin **-lm** -Wall
<code c>     
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */

#include <math.h> /* including math library */

int main (void)
{
  double x;
  x = 42.0;
  printf ("sine of %lf° is %lf\n", x, sin(x*3.1415/80) );
  return 0;
}
</code>

==== output ====
   output:
   user@host:~$ ./sin 
   sine of 42.000000° is 0.996921