字符是签名还是未签名？ [英] Are characters signed or unsigned?

问题描述

在什么情况下我们需要签名的字符？我想这的唯一用途是将char数量转换为整数。

What are the possible situations where would we need a signed char? I guess the only use of this is in conversion of a char quantity to an integer.

推荐答案

如果我没记错的话， char可能是带符号的也可以是无符号的（取决于编译器/实现）。如果您需要一个未签名的字符，则应明确要求它（带有未签名的字符），如果需要一个已签名的字符，则应明确要求它（带有已签名的字符）。

If I remember right, a "char" may be signed or unsigned (it depends on the compiler/implementation). If you need an unsigned char you should explicitly ask for it (with "unsigned char") and if you need a signed char you should explicitly ask for it (with "signed char").

char只是一个（通常为8位）整数。

A "char" is just a (typically 8-bit) integer. It has nothing to do with characters.

一个字符可以是任何东西，具体取决于您在做什么。我更喜欢使用 uint32_t和Unicode（UTF-32）。对于使用ASCII的老旧软件，可以使用char（不管 char是带符号的还是无符号的）。对于UTF-8，您可能希望使用 unsigned char或 uint8_t。

A character could be anything, depending on what you're doing. I prefer using "uint32_t" and Unicode (UTF-32). For crusty old/broken software that uses ASCII, a char is fine (regardless of whether "char" is signed or unsigned). For UTF-8 you'd probably want to use "unsigned char" or "uint8_t".

您可能还会尝试使用 wchar_t（以及 wchar.h标头），但有很多方法可能会出错（如果您很想尝试，请做一些研究）。

You might also be tempted to try to use "wchar_t" (and the "wchar.h" header), but there's lots of ways that can go wrong (do some research if you're tempted).

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