所有维度中包含1个元素的多维数组 [英] Multidimensional array with 1 element in all dimensions

问题描述

问题可能看起来很有趣，但以下声明是否相同？


unsigned char a;

unsigned char b [1];

unsigned char c [1] [1] [1];


我的编译器为a存储一个字节，一个用于b，一个用于c。那么可以像第3行一样声明一个数组吗？或者这是一个捕获？例如，c [0] [0] [0]的处理速度会慢于？


谢谢。

解决方案

这三个定义是不同的，否则它们看起来是一样的。桌子不是牛，因为它们都有四条腿。因此，变量的大小是无关紧要的。


阅读： http://bytes.com/topic/c/insights/77...rrays-revealed

这是一篇非常好的文章，顺便祝贺。我很久以前就已经读过了，但它仍然没有包含我的问题的答案。我同意牛和桌子之间的比较，这就是我问的原因。由于它们都存储1个字节，有什么区别？


我在下面写了这段代码：

展开 | 选择 | Wrap | 行号

这样看：

展开 | 选择 | Wrap | 行号

The question may look funny, but are the following declarations equivalent?

unsigned char a;
unsigned char b[1];
unsigned char c[1][1][1];

My compiler stores one byte for a, one for b and one for c. So is it OK to declare an array like line 3 or is this a catch somewhere? For example will c[0][0][0] be processed slower than a?

Thanks.

解决方案

Thos three definitions are different otherwise they would look the same. A table is not a cow just because they both have four legs. Therefore, the size of the variable is irrelevant.

Read this: http://bytes.com/topic/c/insights/77...rrays-revealed

That''s a very good article, congratulations by the way. I have read it a long time ago but still it does not include an answer for my question. I agree about the comparison between cow and table, that''s why I asked. Since they all store 1 byte, what''s the difference?

I wrote this piece of code below:

Expand|Select|Wrap|Line Numbers

Look at it this way:

Expand|Select|Wrap|Line Numbers

这篇关于所有维度中包含1个元素的多维数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！