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Update ch03-02-data-types.md

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Nango 2020-06-25 15:27:23 -05:00 committed by GitHub
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@ -58,11 +58,11 @@ error[E0282]: type annotations needed
| 数字字面值 | 例子 |
|------------------|---------------|
| Decimal | `98_222` |
| Hex | `0xff` |
| Octal | `0o77` |
| Binary | `0b1111_0000` |
| Byte (`u8` only) | `b'A'` |
| Decimal (十进制) | `98_222` |
| Hex (十六进制) | `0xff` |
| Octal (八进制) | `0o77` |
| Binary (二进制) | `0b1111_0000` |
| Byte (单字节字符)(仅限于`u8`) | `b'A'` |
那么该使用哪种类型的数字呢？如果拿不定主意，Rust 的默认类型通常就很好，数字类型默认是 `i32`：它通常是最快的，甚至在 64 位系统上也是。`isize` 或 `usize` 主要作为某些集合的索引。