int和signed int声明之间的区别 [英] Difference between int and signed int declaration

问题描述

我正在阅读一些有关嵌入式编程的教程，其中一个教程说 int 和 signed int 不同，但确实不解释如何或为什么。

I am reading some tutorials on embedded programming and one of them says int and signed int are different but does not explain how or why.

我理解为什么 unsigned int 和 int 不同，但是 int 和 signed int 不同对我来说是新的。

I understand why unsigned int and int are different but int and signed int being different is a new one for me.

推荐答案

这仅出于历史原因。今天，无论何时声明 int ，您都会得到一个 signed int 。即使今天的编译器，您可能会看到的唯一区别是 char 与 signed char 的区别（并且在分配文字字符串时值得注意），但不能使用 int 。

It is for historical reasons only. Today whenever you declare int you get a signed int. The only point where you might see a difference even with today's compilers is with char versus signed char which are different by specification (and notable when assigning a literal string) but not with int.

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