C中= {0}的长版本是什么?

IMo*_*lo5 3 c

我被问到这个问题:

= { 0 } 是什么更长的代码的"捷径"?

因此,经过我的C书的多次搜索和搜索后,我知道它对聚合初始化所做的一切,但如果我想编写这段代码的较长版本会怎样.以下是程序中的实际代码以防万一

static char vid[25][100] = { 0 } ;
Run Code Online (Sandbox Code Playgroud)

Who*_*aig 7

长版本(你将很难获得更长的时间):

static const char vid[25][100] =
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};
Run Code Online (Sandbox Code Playgroud)

也就是说,decl是静态的,因此首先放在零初始化的内存中,所以这有点多余,但至少你知道它看起来像什么.

  • 使这个更长的另一个想法,使用指定的初始化器:`{[0] = {[0] = 0,[1] = 0,[2] = 0 ...} ...} (5认同)

Mik*_*wan 6

该标准没有定义如何进行归零,因此它的具体实现.实际上,对于局部变量,编译器通常会生成一个memset/ RtlZeroMemory/ etc.为了这.对于static/globals,不需要代码,因为变量将被置于零初始化内存中.