Study of automatic storage class.

#include <stdio.h>

int main(void)
{
/* block 4 */
auto int i = 1;

{ /* block 3 */
int i = 2;

{ /* block 2 */
int i = 3;

{ /* block 1 */
printf( "\nBlock 1. i = %d" , i );
}

printf( "\nBlock 2. i = %d" , i );
}

printf( "\nBlock 3. i = %d" , i );
}

printf( "\nBlock 4. i = %d" , i );

return 0;
}