Program: 140

Write a C program to show the storage, default initial value, scope and life of automatic storage class variables.

Variable Storage Class tells us:

1. Storage (location)
2. Default Initial Value of the variable
3. Scope of the variable
4. Life of the variable

1. Storage: Where the variable would be stored.

2. Default Initial Value: What will be the initial value of the variable, if initial value is not specifically assigned. (i.e. the default initial value)

3. Scope: What is the scope of the variable: i.e. in which functions the value of the variable would be available.

4. Life: What is the life of the variable: i.e. how long would the variable exist.

Automatic Storage Class:

Storage : Memory
Default Initial Values : A garbage Value (unpredictable value)
Scope : Local to the block remains within the block in which the variable defined.
Life : Till the control remains within the block in which the variable is defined.

#include<stdio.h>
int main()
{

    auto int i, j;
    auto int a=1;

    //Print garbage value (or unpredictable value)
    printf("%d %d\n", i,j);

    //Scope of variables
    //auto int a=1;
    {
        auto int a=2;
        {
            auto int a=3;
            printf("%d ",a);
        }
        printf("%d ",a);
    }
    printf("%d \n",a);

    return 0;
}

Output:

16 0
3 2 1