/* atan example */
#include <cstdio>      /* printf */
#include <cmath>       /* atan */

int main ()
{
  double param, result;
  param = 1.0;
  result = atan (param) * 180 / M_PI;
  printf ("The arc tangent of %f is %f degrees\n", param, result );
  return 0;
}