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delete basic_content/const/READ.md extern in line 46 and delete extern in line 64

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chensheng 2020-04-10 20:04:25 +08:00
parent ada2b0c80f
commit e290e51a4b
1 changed files with 3 additions and 2 deletions
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basic_content/const/README.md
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@ -51,7 +51,7 @@ int ext
* compile: g++ -o file file2.cpp file1.cpp * compile: g++ -o file file2.cpp file1.cpp
* execute: ./file * execute: ./file
*/ */
extern int ext; int ext;
int main(){ int main(){
std::cout<<(ext+10)<<std::endl; std::cout<<(ext+10)<<std::endl;
} }
@ -61,7 +61,7 @@ int main(){
```c++ ```c++
//extern_file1.cpp //extern_file1.cpp
extern const int ext=12; const int ext=12;
//extern_file2.cpp //extern_file2.cpp
#include<iostream> #include<iostream>
/** /**
@ -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> <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 ## 4.定义常量
```c++ ```c++