Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In computer programming, an automatic variable is a lexically-scoped variable which is allocated and de-allocated automatically when program flow enters and leaves the variable's scope. The term local variable is usually synonymous with automatic variable, since these are the same thing in many programming languages.All variables declared within a block of code are automatic by default, but this can be made explicit with the auto keyword. An uninitialized automatic variable has an undefined value until it is assigned a valid value of its type.Using the storage class register instead of auto is a hint to the compiler to cache the variable in a processor register. Other than not allowing the referencing operator (

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