Automatic ( Auto ) storage class in C Programming

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Automatic ( Auto ) storage class in C Programming

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1. This is default storage class
2. All variables declared are of type Auto by default 
3. In order to Explicit declaration of variable use 'auto' keyword

auto int num1 ;   // Explicit Declaration  

Features :

Storage	Memory
Scope	Local / Block Scope
Life time	Exists as long as Control remains in the block
Default initial Value	Garbage

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Live Example :

void main()
{
 auto mum = 20 ;
 {
      auto num = 60 ;
             printf("\nNum : %d",num);
 }
 printf("\nNum : %d",num);
}

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Output :

Num : 60
Num : 20

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Note :

Two variables are declared in different blocks , so they are treated as different variables

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Tags / Keywords : | Auto, automatic storage class, block scope, local scope

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