题目内容

As long as a function has not returned control to its calling function, all automatic variables local to the function are “alive”; that is, storage for the variables is available.

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Once created, local static variables remain in existence for the life of the program.

The initialization of static variables (both local and global) is done only once, when the program is first compiled.

Unlike automatic variables that can be initialized by either constants or expressions using both constants and previously initialized variables, static variables can only be initialized using constants or constant expressions.

You can take the address of a register variable using the address operator &.