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

问题描述

如果我错了，请更正我。

Correct me if I am wrong,

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

long是4个字节，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 ++有什么区别？它们是否可以互换使用？

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

推荐答案

例如，在Windows下，它们是相同的，但是例如在Alpha系统上，long是64位，而int是32位。本文章涵盖了在可变平台上的Intel C ++编译器的规则。总结：

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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