用C初始化变量 [英] Initializing variables in C

问题描述

只是一个一般性的问题，对不起，如果这是不恰当的，因为我知道这是一个具体的问题和答案的网站，但我认为，因为这是学习的好有具体的答案尽可能的。

Just a general question, sorry if this is inappropriate because I know this is a specific question and answer website, but I think since this is for learning its good to have as specific of an answer as possible.

我知道有时候，如果你不初始化一个int，你会得到一个随机数，如果你打印整数。

I know that sometimes if you don't initialize an int, you will get a random number if you print the integer.

但一切都初始化为零似乎有点傻。

But initializing everything to zero seems kind of silly.

我问，因为我评论了我的C项目，我直是pretty的缩进，它完全编译（90/90谢谢＃1），但我想要得到的样式点10/10 。

I ask because I'm commenting up my C project and I'm pretty straight on the indenting and it compiles fully (90/90 thank you Stackoverflow) but I want to get 10/10 on the style points.

因此​​，问题：是时候适当进行初始化，你什么时候应该只是声明一个变量：

So, the question: when is it appropriate to initialize, and when should you just declare a variable:

    int a = 0;

VS。

    int a;

由于戈斯

推荐答案

这还没有被提及的规则是这样的：当变量的函数中声明其将不会被初始化，并且当它在静态声明或全球范围内将其设置为0：

A rule that hasn't been mentioned yet is this: when the variable is declared inside a function it is not initialised, and when it is declared in static or global scope it's set to 0:

int a; // is set to 0

void foo() {
  int b;  // set to whatever happens to be in memory there
}

不过 - 对于可读性我通常会在初始化声明时的一切。

However - for readability I would usually initialise everything at declaration time.

如果您有兴趣学习这种细节的东西，我建议你这个presentation 和这本书

If you're interested in learning this sort of thing in detail, I'd recommend this presentation and this book

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