External and static variables are initialized to zero by default. Automatic variables for which is no explicit initializer have undefined (i. e., garbage) values.
外部变量和静态变量初始的时候默认值为零，自动变量在初始的时候是没有默认值的。
External and static variables are initialized to zero by default. Automatic variables for which is no explicit initializer have undefined (i. e., garbage) values.
外部变量和静态变量初始的时候默认值为零，自动变量在初始的时候是没有默认值的。
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