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@ -76,6 +76,7 @@ int main(){
```
<p><font style="color:red">小结可以发现未被const修饰的变量不需要extern显式声明而const常量需要显式声明extern并且需要做初始化因为常量在定义后就不能被修改所以定义时必须初始化。</font></p>
## 4.定义常量
```c++