How to set value of extern variable?
如何设置走读生变量的值呢？
How to define extern variable along with declaration?
如何定义外部变量和声明？
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。
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