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trpl-zh-cn/src/ch03-04-comments.md

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## 注释
> [ch03-04-comments.md](https://github.com/rust-lang/book/blob/master/second-edition/src/ch03-04-comments.md)
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> <br>
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> commit d4c77666f480edfb960cc9b11a31c42f4b90c745
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所有编程语言都力求使其代码易于理解,不过有时需要提供额外的解释。在这种情况下,程序员在源码中留下记录,或者 **注释***comments*),编译器会忽略它们不过其他阅读代码的人可能会用得上。
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这是一个简单的注释的例子:
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```rust
// Hello, world.
```
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在 Rust 中,注释必须以两道斜杠开始,并持续到本行的结尾。对于超过一行的注释,需要在每一行都加上 `//`,像这样:
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```rust
// So were doing something complicated here, long enough that we need
// multiple lines of comments to do it! Whew! Hopefully, this comment will
// explain whats going on.
```
注释也可以在放在包含代码的行的末尾:
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<span class="filename">文件名: src/main.rs</span>
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```rust
fn main() {
let lucky_number = 7; // Im feeling lucky today.
}
```
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不过你会经常看到它们用于这种格式,也就是位于它所解释的代码行的上面一行:
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<span class="filename">文件名: src/main.rs</span>
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```rust
fn main() {
// Im feeling lucky today.
let lucky_number = 7;
}
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```
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Rust 还有另一种注释,称为文档注释,我们将在 14 章讨论它。