C++ 中的 int 和 long 有什么区别? [英] What is the difference between an int and a long in C++?

问题描述

如果我错了，请纠正我，

Correct me if I am wrong,

int 是 4 个字节，取值范围从 -2,147,483,648 到 2,147,483,647 (2^31)
long 是 4 个字节，取值范围从 -2,147,483,648 到 2,147,483,647 (2^31)

int is 4 bytes, with a range of values from -2,147,483,648 to 2,147,483,647 (2^31)
long is 4 bytes, with a range of values from -2,147,483,648 to 2,147,483,647 (2^31)

C++ 有什么不同?它们可以互换使用吗?

What is the difference in C++? Can they be used interchangeably?

推荐答案

它依赖于实现.

例如，在 Windows 下它们是相同的，但例如在 Alpha 系统上，long 是 64 位，而 int 是 32 位.这个文章 涵盖了英特尔 C++ 编译器在可变平台上的规则.总结一下:

For example, under Windows they are the same, but for example on Alpha systems a long was 64 bits whereas an int was 32 bits. This article covers the rules for the Intel C++ compiler on variable platforms. To summarize:

  OS           arch           size
Windows       IA-32        4 bytes
Windows       Intel 64     4 bytes
Windows       IA-64        4 bytes
Linux         IA-32        4 bytes
Linux         Intel 64     8 bytes
Linux         IA-64        8 bytes
Mac OS X      IA-32        4 bytes
Mac OS X      Intel 64     8 bytes  

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