#define和const的區別

原創 hegang1314 2020-02-21 19:40

1）語法

#define 宏名稱 宏值   (注：無分號和等號)                       

const (數據類型) 常量名=常量值;   或(數據類型) const 常量名=常量值;

2）內存空間分配

#define不分配內存空間                                          

const在一般情況下不分配存儲空間，但是如果有extern修飾或取一個const的地址，則會分配存儲空間

3）安全性

#define無任何檢查，如類型和語法結構，不安全         

const有類型檢查，可以排除故障，比較安全

hegang1314
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