什么是符号和无符号值是什么意思？ [英] What does signed and unsigned values mean?

问题描述

这是什么签署意思是用C？我有此表显示：

What does signed mean in C? I have this table to show:

这是符号字符 128 到 +127 所以 128 也是一个正整数，比这可怎么像 +128 到 +127 还是 128 和 +127 有不同的含义？我指的是一个preSS 开始ç书

This says signed char 128 to +127 so 128 is also a positive integer, than how this can be something like +128 to +127 Or is 128 and +127 have different meanings? I am referring Apress Beginning C book

推荐答案

一个符号整型可以重新present负数;无符号不能。

A signed integer can represent negative numbers; unsigned cannot.

符号整数有不确定的行为，如果他们溢出，同时无符号整数回绕使用模。

Signed integers have undefined behavior if they overflow, while unsigned integers wrap around using modulo.

请注意，该表是不正确。首先，它缺少 - 体征（如-128到+127）。其次，标准不保证这些类型的必须的落在这些范围之内。

Note that that table is incorrect. First off, it's missing the - signs (such as -128 to +127). Second, the standard does not guarantee that those types must fall within those ranges.

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