PROGRAMING
Every variable has two properties
Storage class mean variable scope lifetime and visibility. There are four types of storage class:
A variable has declared inside a block count as local or automatic variable. For example
Variable has declared outside of the main and others user define function, that all are count as external variable.
Register variable always declare by register keyword. They are known bit faster than automatic variable for modern compiler.
A static variable is declared by using the static keyword. During the program execution time static variable will initialized only first time.
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