1 External and static variables are initialized to zero by default. Automatic variables for which is no explicit initializer have undefined (i.e., garbage) values.
1 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。