问题描述
这似乎所有的人都需要4个字节的空间，
It seems all of them take 4 bytes of space,
有啥区别？
推荐答案
首先，int的长度/长是不确定的。所以，你的编译器，一个 INT 和长可能是相同的，但是这不是跨编译器普及。
First of all, the size of int/long is unspecified. So on your compiler, an int and a long might be the same, but this isn't universal across compilers.
至于之间的差异无符号长和长：
假设4个字节，一个长的 -2,147,483,648 到 2,147,483,647 。一个unsigned long具有 0 向范围 4,294,967,295 。
Assuming 4 bytes, a long has the range of -2,147,483,648 to 2,147,483,647. An unsigned long has the range of 0 to 4,294,967,295.
另外一个区别是溢出。对于一个符号类型，溢出具有不确定的行为。但对于无符号类型，溢出是保证环绕。
One other difference is with overflow. For a signed type, an overflow has unspecified behavior. But for an unsigned type, overflow is guaranteed to "wrap around."
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