根据我们在课堂上学到的，有符号整数既可以表示正数也可以表示负数，而无符号整数只能表示非负数。

例如，看一个8位的数字:

无符号值为0到255

带符号的取值范围为-128 ~ 127

一般来说，这是正确的。在不知道你为什么要寻找差异的情况下，我想不出有符号和无符号之间的任何其他区别。

在嵌入式系统上编程时，必须使用无符号整数。在循环中，当不需要有符号整数时，使用无符号整数将节省设计此类系统所需的安全。

他只问了签过名和没签过名的。不知道为什么人们要在里面加额外的东西。让我来告诉你答案。

Unsigned:它只包含非负值，即0到255。 Signed:由正负值组成，但格式不同，如 0 ~ +127 -1 ~ -128

这个解释是关于8位数字系统的。

除此之外，在C语言中，你不能溢出一个无符号整数;行为被定义为模算术。您可以溢出一个有符号整数，并且在理论上(尽管在当前主流系统上没有实践)，溢出可能会触发一个错误(可能类似于除零错误)。

为了完整起见，这里只提几点:

this answer is discussing only integer representations. There may be other answers for floating point; the representation of a negative number can vary. The most common (by far - it's nearly universal today) in use today is two's complement. Other representations include one's complement (quite rare) and signed magnitude (vanishingly rare - probably only used on museum pieces) which is simply using the high bit as a sign indicator with the remain bits representing the absolute value of the number. When using two's complement, the variable can represent a larger range (by one) of negative numbers than positive numbers. This is because zero is included in the 'positive' numbers (since the sign bit is not set for zero), but not the negative numbers. This means that the absolute value of the smallest negative number cannot be represented. when using one's complement or signed magnitude you can have zero represented as either a positive or negative number (which is one of a couple of reasons these representations aren't typically used).