Java:BigInteger floor和ceil函数 [英] Java: BigInteger floor and ceil functions

问题描述

我正在尝试用Java实施RSA攻击，并且我需要计算诸如floor和ceil到BigInteger变量的数学运算.我们知道math.ceil和math.floor仅适用于双变量，您知道我可以通过其他任何方式为BigIntegers计算下限和上限吗?谢谢.

I'm trying to implement an RSA attack in Java and I need to compute math operations like floor and ceil to BigInteger variables. As we know math.ceil and math.floor only apply to double variables, do you know any other way I can compute floor and ceil for BigIntegers? Thank you.

推荐答案

由于BigInteger值是整数，因此我假设您需要除法运算的上限和下限.为此，我建议您使用 BigDecimal 反而.它具有方法divide，该方法采用另一个BigDecimal和 MathContext .在MathContext中，您可以将舍入模式指定为上限或下限(以及其他).

Since BigInteger values are integers, I assume that you want the the ceiling and floor of division operations. For that, I suggest that you use BigDecimal instead. It has a method divide that takes another BigDecimal and a MathContext. In the MathContext, you can specify the rounding mode as ceiling or floor (among others).

如果您需要的全部舍入为零，也可以使用BigDecimal.divideToIntegralValue.

If all you need is rounding toward zero, you can also use BigDecimal.divideToIntegralValue.

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