#include <stdio.h>
int main()
{
    {
        int a = 25;
        printf("a == %d Outer block value\n", a);
        
        /* a nested block */
        {
            printf("a == %d Nested block value referring to outer block value\n", a);
            int a = 27;
            printf("a == %d Nested block value - local block value\n", a);
        }
        printf("a == %d Post-nested block value\n", a);
    }
    
/* a non-nested block */
    {
        int b;
        b=27;
    }
return 0;
}