什么是整数溢出错误? [英] What is an integer overflow error?

问题描述

什么是整数溢出错误? 我为什么要关心这样的错误? 有什么方法可以避免或预防它?

解决方案

当您尝试表达的数字大于整数类型可以处理的最大数字时，就会发生整数溢出.

如果尝试在一个字节中表示数字300，则整数溢出(最大为255).在两个字节中的100,000也是整数溢出(最大65,535).

您需要在意它，因为数学运算不会像您期望的那样运行.如果您有整数溢出，则A + B实际上不等于A和B的总和.

通过首先不创建条件来避免这种情况(通常是通过将整数类型选择为足够大而不会溢出)，或者通过限制用户输入以免发生溢出). /p>

What is an integer overflow error? Why do i care about such an error? What are some methods of avoiding or preventing it?

解决方案

Integer overflow occurs when you try to express a number that is larger than the largest number the integer type can handle.

If you try to express the number 300 in one byte, you have an integer overflow (maximum is 255). 100,000 in two bytes is also an integer overflow (65,535 is the maximum).

You need to care about it because mathematical operations won't behave as you expect. A + B doesn't actually equal the sum of A and B if you have an integer overflow.

You avoid it by not creating the condition in the first place (usually either by choosing your integer type to be large enough that you won't overflow, or by limiting user input so that an overflow doesn't occur).

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