在C文件范围内动态可变数组 [英] variably modified array at file scope in C

问题描述

我有一些code是这样的：

I have some code like this:

static int a = 6;
static int b = 3;

static int Hello[a][b] =
{
    { 1,2,3},
    { 1,2,3},
    { 1,2,3},
    { 1,2,3},
    { 1,2,3},
    { 1,2,3}
};

但是当我编译它，它说错误：

but when I compile it, it says error:

在文件范围内动态可变你好

variably modified 'Hello' at file scope

怎么会发生这种事？我怎么能解决这个问题？

how could this happen? and how could I fix it?

推荐答案

您不能有静态数组的大小而给出一个变量

You can not have static array which size is given as a variable

这就是为什么常量应的#define D：

That's why constants should be #defined:

#define a 6

此方法preprocessor将取代 A 与 6 ，使其成为有效的申报。

This way preprocessor will replace a with 6, making it valid declaration.

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