在 C 中初始化变量 [英] Initializing variables in C

问题描述

我知道有时候如果你不初始化一个int，你打印整数就会得到一个随机数.

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

但是将所有内容初始化为零似乎有点愚蠢.

But initializing everything to zero seems kind of silly.

我问是因为我正在评论我的 C 项目，而且我对缩进非常直接，它可以完全编译(90/90，谢谢 Stackoverflow)，但我想在样式点上获得 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.

那么，问题来了:什么时候适合初始化，什么时候应该声明一个变量:

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

int a = 0;

对比

int a;

推荐答案

一个还没有被提及的规则是:当变量在函数内部声明时它没有被初始化，而当它在静态或全局范围设置为 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
}

但是 - 为了便于阅读，我通常会在声明时初始化所有内容.

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

如果您有兴趣详细了解此类内容，我会推荐 此演示文稿 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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