/*
 *  call-seq:
 *     Math.atan(x)    => float
 *  
 *  Computes the arc tangent of <i>x</i>. Returns -{PI/2} .. {PI/2}.
 */

static VALUE
math_atan(VALUE obj, VALUE x)
{
    Need_Float(x);
    return DOUBLE2NUM(atan(RFLOAT_VALUE(x)));
}