是否总是对int进行签名? [英] Is `int` always signed?

问题描述

我一直认为在C语言中， int 代表 signed int ；但是我听说这种行为是特定于平台的，在某些平台上，默认情况下 int 是 unsigned .是真的吗该标准说了什么，它随着时间的推移而发展了吗?

I always thought that in C, int stands for signed int ; but I have heard that this behavior is platform specific and in some platforms, int is unsigned by default. Is it true? What says the standard, and has it evolved over time?

推荐答案

您说得很对.按照 C11 (最新的 c 标准)，第6.7.2章

You are quite right. As per C11 (the latest c standard), chapter §6.7.2

• int ， signed 或 signed int

被归为相同的 type (确切地说是类型说明符).因此， int 与 signed int 相同.

is categorized as same type (type specifiers, to be exact). So, int is the same as signed int.

在第6.2.5/P4章中再次重申相同的内容

Also, re-iterating the same, from chapter §6.2.5/P4

有五种标准有符号整数类型，分别指定为 signed char ， shortint ， int ， long int 和 long long int .(这些和其他类型可能是以其他几种方式指定，如6.7.2所述.)[....]

There are five standard signed integer types, designated as signed char, short int, int, long int, and long long int. (These and other types may be designated in several additional ways, as described in 6.7.2.) [....]

因此，对于任何符合标准的环境， int 代表 signed int ，反之亦然.

So, for any conforming environment, int stands for signed int and vice versa.

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