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有一个双精度数和所需的舍入数,我如何得到下一个bigger/smaller rounded number?
bigger/smaller rounded number
样本
N = 10.476 Prec = 0.25 Smaller = 10.25 Bigger = 10.50 N = 0.837 Prec = 0.005 Smaller = 0.835 Bigger = 0.840
def round_smaller(n, prec) (n / prec).floor * prec end def round_bigger(n, prec) (n / prec).ceil * prec end
我在使用没有类属性的 usebean 标记时感到困惑,如 head first servlets 中给出的示例
它说 person bean 必须已经存在,那么只有它才能工作。
所以我的问题是,我们是否有可能使这项工作成为可能,因为如果 bean 已经在页面范围内声明(那么它必须在同一页面中声