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# Storage-Class Specifier

The storage-class-specifier can be one of the following:

typedef | Serves as a type-specifier for another type-specifier. This does not create a variable—it is merely for convenience.
extern | Indicates that the variable is defined outside of the current file. This brings the variables scope into the current scope. No variable is actually created by this declaration.
static | Causes a variable that is defined within a function to be preserved in subsequent calls to the function.
auto | Causes a local variable to have a local lifetime (default).
register | Requests that the variable be accessed as quickly as possible. This request is not guaranteed. Normally, the variable's value is kept within a CPU register for maximum speed.

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