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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)
> <br>
> commit d06a6a181fd61704cbf7feb55bc61d518c6469f9
所有编程语言都力求使它们的代码易于理解，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**（
这是一个注释的例子：
```rust
// Hello, world.
```
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：
```rust
// So we’
// multiple lines of comments to do it! Whew! Hopefully, this comment will
// explain what’
```
注释也可以在放在包含代码的行的末尾：
< span class = "filename" > 文件名: src/main.rs</ span >
```rust
fn main () {
let lucky_number = 7 ; // I’
}
```
不过你会经常看到它们被以这种格式使用，也就是位于它所解释的代码行的上面一行：
< span class = "filename" > 文件名: src/main.rs</ span >
```rust
fn main () {
// I’
let lucky_number = 7 ;
}
```
Rust 还有另一种注释，称为文档注释，我们将在 14 章讨论它。
