How to define extern variable along with declaration?
如何定义外部变量和声明？
This variable is then merely declared as an extern variable inside the main .
此变量然后仅仅声明为一个外来的变量在主。
No matter where you declare a variable or function, the extern keyword allows other files to use it without knowing where it was defined.
不管在哪里声明一个变量或函数，extern关键字都允许其他文件在不确定其定义位置的情况下使用该文件。
How to declare an 'extern' variable in VBA?
如何声明一个“外来的”变量在VBA吗？
If you are using extern keyword then you can use the variable without declaring it in the same file.
如果您使用的是外面的关键词，那么你可以使用变量没有宣布它在同一个文件中。
As Dietmar Kühl said, without "extern", you have multiple definitions of the same variable which will violate ODR.
迪特马尔库尔说，没有“外来的”，有多个同一变量的定义，这将违反ODR。
We can provide an initializer on a variable defined as extern, but doing so overrides the extern.
我们可以初始化一个变量定义为提供一个外部，但这样重写。
Note the need for the extern keyword2003 because otherwise a const array variable would have internal linkage.
因为记得文件范围内的函数与变量默认都是外部链接。
Note the need for the extern keyword2003 because otherwise a const array variable would have internal linkage.
因为记得文件范围内的函数与变量默认都是外部链接。
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