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42 lines
1.5 KiB
Markdown
42 lines
1.5 KiB
Markdown
## 注释
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> [ch03-04-comments.md](https://github.com/rust-lang/book/blob/main/src/ch03-04-comments.md)
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> <br>
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> commit d0acb2595c891de97a133d06635c50ab449dd65c
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所有程序员都力求使其代码易于理解,不过有时还需要提供额外的解释。在这种情况下,程序员在源码中留下 **注释**(*comments*),编译器会忽略它们,不过阅读代码的人可能觉得有用。
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这是一个简单的注释:
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```rust
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// hello, world
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```
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在 Rust 中,惯用的注释样式是以两个斜杠开始注释,并持续到本行的结尾。对于超过一行的注释,需要在每一行前都加上 `//`,像这样:
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```rust
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// So we’re doing something complicated here, long enough that we need
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// multiple lines of comments to do it! Whew! Hopefully, this comment will
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// explain what’s going on.
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```
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注释也可以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
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{{#rustdoc_include ../listings/ch03-common-programming-concepts/no-listing-24-comments-end-of-line/src/main.rs}}
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```
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不过你更经常看到的是以这种格式使用它们,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
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{{#rustdoc_include ../listings/ch03-common-programming-concepts/no-listing-25-comments-above-line/src/main.rs}}
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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 章的 [“将 crate 发布到 Crates.io” ][publishing]部分讨论它。
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[publishing]: ch14-02-publishing-to-crates-io.html
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