Chapter27 初稿 #2
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Chapter27 初稿 #2
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Zenologo
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Jun 13, 2021
| ## 本章中能学到的内容 | ||
| 什么是枚举？ | ||
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| 如何在 Go 语言中创建枚举 |
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| - 首先，我们声明了一个新的类型 `HTTPMethod`（其基础类型是整型 `int`）。 | ||
| - 然后我们创建了9个 `HTTPMethod` 类型的常量 | ||
| - 每个常量的类型都是 `HTTPMethod`，其命名方式与其指定的HTTP方法类似。 |
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- 每个常量都是
HTTPMethod类型，并且我们用 HTTP 的方法名做为常量名。
| - 然后我们创建了9个 `HTTPMethod` 类型的常量 | ||
| - 每个常量的类型都是 `HTTPMethod`，其命名方式与其指定的HTTP方法类似。 | ||
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| ### 为什么是整型？ |
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| ### 使用示例 | ||
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| 想象你现在有一个处理 HTTP 请求的函数，在这个函数中，你希望用户给你一个 HTTP 方法，并希望处理一组预定义的方法。那你的函数可以定义一个 `HTTPMethod` 类型的参数（也可以替换成整型 `int`）: |
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想象你现在有一个处理 HTTP 请求的函数。
在这个函数中，你希望预先定义好一组方法用于处理用户发送过来的 HTTP 请求。那你的函数可以定义一个 HTTPMethod 类型的参数（也可以替换成整型 int）:
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| 1. Go语言版本 1 是否支持枚举类型？ | ||
| 2. 代码中 `OptA` 的值是多少? | ||
| 3. 写出 AND，OR，XOR，NOT，AND NOT 的操作符号。 |
| 2. 代码中 `OptA` 的值是多少? | ||
| 3. 写出 AND，OR，XOR，NOT，AND NOT 的操作符号。 | ||
| 4. `OptC` 是什么类型? | ||
| 5. 二进制数字向左移位的运算符是哪个? |
| 3. 写出 AND，OR，XOR，NOT，AND NOT 的操作符号。 | ||
| 4. `OptC` 是什么类型? | ||
| 5. 二进制数字向左移位的运算符是哪个? | ||
| 6. 将二进制数字偏移到左边的运算符是哪个? |
| 5. AND NOT：`&^` | ||
| 4. `OptC` 是什么类型? | ||
| 1. `Elem` | ||
| 5. 二进制数字向左移位的运算符是哪个? |
| 1. `Elem` | ||
| 5. 二进制数字向左移位的运算符是哪个? | ||
| 1. `<<` | ||
| 6. 将二进制数字偏移到左边的运算符是哪个? |
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