为size_t和unsigned int之间的区别？ [英] Difference between size_t and unsigned int?

问题描述

我很困惑为size_t 。我已经搜索在互联网上到处都提到为size_t 是一个无符号的类型，这样，就可以重新present非负值。

我的第一个问题是，如果是用来重新present非负值，我们为什么不使用 unsigned int类型而不是为size_t ？

我的第二个问题是：为size_t 和 unsigned int类型互换或不？如果没有，那么为什么呢？

和任何人都可以给我为size_t 的一个很好的例子，其短暂的工作？

解决方案

  

如果使用重新present非负值，所以我们为什么不使用 unsigned int类型而不是为size_t

由于 unsigned int类型不是唯一的无符号整数类型。 为size_t 可以是任何将unsigned char ，无符号短， unsigned int类型，无符号长或无符号长长，视就执行。

  

第二个问题是，为size_t和unsinged INT可以互换与否，如果没有，为什么？

他们是不能互换的，对于上面的原因解释 ^ ^ 。

  

和任何人都可以给我为size_t的一个很好的例子，其短暂的工作？

我不太让你的它短暂的工作的意思。它的工作原理是任何其他无符号类型（尤其是，像类型它typedeffed到）。我们鼓励您使用为size_t 当你描述一个物体的大小。尤其是，的sizeof 运营商和各类标准库函数，如的strlen（），返回为size_t 。

奖励：这里是一个很好的文章（文章删除，请使用<一个href=\"http://web.archive.org/web/20140828142605/http://www.$c$cproject.com/Articles/60082/About-size_t-and-ptrdiff_t\">wayback机快照）关于为size_t （以及与之密切相关的 ptrdiff_t的类型）。原因吧非常好，为什么你应该使用它。

I am so confused about size_t. I have searched on the internet and everywhere mentioned that size_t is an unsigned type so, it can represent non-negative value.

My first question is that if it is uses to represent non negative values, why don't we use unsigned int instead of size_t?

My second question is: are size_t and unsigned int interchangeable or not? If not then why?

And can anyone give me a good example of size_t and its brief working?

解决方案

if it is use to represent non negative value so why we not using unsigned int instead of size_t

Because unsigned int is not the only unsigned integral type. size_t could be any of unsigned char, unsigned short, unsigned int, unsigned long or unsigned long long, depending on the implementation.

Second question is that size_t and unsinged int are interchangable or not and if not then why?

They aren't interchangeable, for the reason explained above ^^.

And can anyone give me a good example of size_t and its brief working ?

I don't quite get what you mean by "its brief working". It works like any other unsigned type (in particular, like the type it's typedeffed to). You are encouraged to use size_t when you are describing the size of an object. In particular, the sizeof operator and various standard library functions, such as strlen(), return size_t.

Bonus: here's a good article (article deleted, use wayback machine snapshot) about size_t (and the closely related ptrdiff_t type). It reasons very well why you should use it.

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