保证 C 数据类型的最小大小/范围 [英] Guarantateed minimum size/range of C data types

问题描述

对于这个问题，我找到了不同的答案，我知道肯定只有一个答案.C 中四种主要数据类型的最小分配内存大小是多少?int、double、float 和 char 是我想到的.signed 或 unsigned 类型是否以任何方式改变大小?

I have found varying answers to this question, and I know there must be one definitive answer. What is the minimum allocated memory size of the four main data types in C? int, double, float, and char are what I'm thinking of. Do the signed or unsigned types alter the size in any way?

推荐答案

你可以使用sizeof(variable):

作为在我的本地机器上运行的示例:

As an example running this on my local machine:

sizeof (char)   = 1
sizeof (double) = 8
sizeof (float)  = 4
sizeof (int)    = 4
sizeof (long)   = 4
sizeof (long long)  = 8
sizeof (short)  = 2
sizeof (void *) = 4

注意:您得到的值可能由操作系统/编译器/CPU 架构决定.

Note: the values you get may be determined by OS/Compiler/CPU architecture.

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