你应该总是使用'​​int'C中的数字，即使它们是非负数吗？ [英] Should you always use 'int' for numbers in C, even if they are non-negative?

问题描述

我始终使用 unsigned int 不应为负值。但是今天我在我的代码注意到这种情况：

I always use unsigned int for values that should never be negative. But today I noticed this situation in my code:

void CreateRequestHeader( unsigned bitsAvailable, unsigned mandatoryDataSize, 
    unsigned optionalDataSize )
{
    If ( bitsAvailable – mandatoryDataSize >= optionalDataSize ) {
        // Optional data fits, so add it to the header.
    }

    // BUG! The above includes the optional part even if
    // mandatoryDataSize > bitsAvailable.
}

我应该开始使用 int

推荐答案

$ b>> unsigned int $ b

我应该永远...

Should I always ...

我应该永远...的答案几乎肯定是 '，有很多因素决定你是否应该使用数据类型 - 一致性很重要。

The answer to "Should I always ..." is almost certainly 'no', there are a lot of factors that dictate whether you should use a datatype- consistency is important.

但是，这是一个非常主观的问题， up unsigneds：

But, this is a highly subjective question, it's really easy to mess up unsigneds:

for (unsigned int i = 10; i >= 0; i--);

会导致无限循环。

这就是为什么某些样式指南（ Google的包含）阻止 unsigned 数据类型。

This is why some style guides (Google's included) discourage unsigned data types.

我个人认为，我没有遇到过许多由无符号数据类型 - 我想说使用断言检查你的代码，并明智地使用它们（当你执行算术时更少）。

In my personal opinion, I haven't run into many bugs caused by these problems with unsigned data types - I'd say use assertions to check your code and use them judiciously (and less when you're performing arithmetic).

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