签字/ unsigned char型的区别 [英] Difference between signed / unsigned char

问题描述

所以我知道有符号和无符号整数之间的区别在于，一个位用于表示如果该号码是否积极或消极，但这是如何应用到一个char？一个角色怎么能是积极还是消极的？

So I know that the difference between a signed and unsigned int is that a bit is used to signify if the number if positive or negative, but how does this apply to a char? How can a character be positive or negative?

推荐答案

有在C语言中没有专门的字符类型。 字符是一个整数类型，相同的（在这方面）为 INT ，短和其他整数类型。 字符恰好是最小的整数类型。因此，就像任何其他整数类型，它可以带符号。

There's no dedicated "character type" in C language. char is an integer type, same (in that regard) as int, short and other integer types. char just happens to be the smallest integer type. So, just like any other integer type, it can be signed or unsigned.

这是事实，（顾名思义）字符主要是打算用来重新present字符。但在C字符重新$ P $它们的整数codeSpsented，所以没有什么不寻常的，整数类型字符是用来服务于一个事实，目的。

It is true that (as the name suggests) char is mostly intended to be used to represent characters. But characters in C are represented by their integer "codes", so there's nothing unusual in the fact that an integer type char is used to serve that purpose.

一般只字符和其它整数类型不同的是，普通的字符通常与<$不是同义词C $ C>符号字符，同时与其他整数类型的签署修饰符是可选/暗示的保证。

The only general difference between char and other integer types is that plain char is generally not synonymous with signed char, while with other integer types the signed modifier is optional/implied.

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