Update README.md

eeedayu · May 4, 2020 · e33eadc · e33eadc
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diff --git a/basic_content/const/README.md b/basic_content/const/README.md
@@ -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>
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 ## 4.定义常量
 
 ```c++