floor

/*
 *  call-seq:
 *     num.floor    => integer
 *
 *  Returns the largest integer less than or equal to <i>num</i>.
 *  <code>Numeric</code> implements this by converting <i>anInteger</i>
 *  to a <code>Float</code> and invoking <code>Float#floor</code>.
 *
 *     1.floor      #=> 1
 *     (-1).floor   #=> -1
 */

static VALUE
num_floor(num)
    VALUE num;
{
    return flo_floor(rb_Float(num));
}