c ++除以0 [英] c++ division by 0

问题描述

我正在进行长时间模拟。我将结果记录到向量中以计算有关数据的统计信息。我意识到，在理论上，这些样本可能是零除法的结果;这只是理论，我很确定不是这样。为了避免在修改代码后重新运行模拟，我想知道在这种情况下会发生什么。我能够实现是否发生0除法？我会收到错误消息吗？ （目前未处理异常）。

I am running long simulations. I record the results into a vector to compute statistics about the data. I realized that, in theory, those samples could be the result of a division by zero; this is only theoretical, I am pretty sure it's not the case. In order to avoid rerunning the simulation after modifying the code, I was wondering what happens in that case. Would I be able to realize whether a division by 0 has occurred or not? Will I get error messages? (Exceptions are not being handled at the moment).

感谢

推荐答案

对于IEEE浮点，有限非零float by 0是明确定义的，并导致+无穷大（如果值>零）或-infinity（如果值小于零）。 0/0的结果是NaN。如果使用整数，行为是未定义的。

For IEEE floats, division of a finite nonzero float by 0 is well-defined and results in +infinity (if the value was >zero) or -infinity (if the value was less than zero). The result of 0/0 is NaN. If you use integers, the behaviour is undefined.

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