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There are four storage class specifiers in C and C++. These are -

1. auto : The storage specifier auto refers to automatic variable declaration. The life of an automatic variable is the time during which its parent function is running. The scope of an auto variable is the function scope. They can be accessed only from their parent functions.

Syntax : auto int a;

2. register : A register variable has all the characteristics of an auto variable. The only difference is that auto variable uses the main memory to store data and register uses the CPU registers.

3. extern : This storage specifier is used to declare a global variable. The life of these variables is the time during which the program runs.

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