code: function bcscale(scale) {
      scale = parseInt(scale, 10);
      if (isNaN(scale)) {
          return false;
      }
      if (scale < 0) {
          return false;
      }
      libbcmath.scale = scale;
      return true;
  }
docs: bcscale - Set default scale parameter for all bc math functions
  @param int   scale   The scale factor (0 to infinate)
  @return bool