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Merge pull request #82 from Charmve/patch-1

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新增 #define与const的区别
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huihut 2021-09-23 00:03:20 +08:00 committed by GitHub
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@ -122,6 +122,17 @@ const int* function6(); // 返回一个指向常量的指针变量，使用
int* const function7(); // 返回一个指向变量的常指针，使用：int* const p = function7();
```
#### 宏定义 #define 和 const 常量
宏定义 #define|const 常量
---|---
宏定义，相当于字符替换|常量声明
预处理器处理|编译器处理
无类型安全检查|有类型安全检查
不分配内存|要分配内存
存储在代码段|存储在数据段
可通过 `#undef` 取消|不可取消
### static
#### 作用