Consider the following C program:

       #include < stdio.h >
       int main()
       {
           int a[] = {2, 4, 6, 8, 10} ;
           int i, sum = 0, *b = a + 4 ;
           for (i = 0; i < 5; i++)
                 sum = sum + (*b - i) - *(b - i) ;
           printf ("%d\n", sum) ;
           return 0 ;
        }

The output of the above C program is _____.

Consider the following C program :

#include < stdio.h >
 int main ()  {
            int arr [] = {1,2,3,4,5,6,7,8,9,0,1,2,5}, *ip = arr+4;
             printf ("%d\n", ip[1]);
             return 0;
}

The number that will be displayed on execution of the program is _______.

For Σ = {a, b}, let us consider the regular language L = {x | x = a^2+3k or x = b^10+12k, k ≥ 0}. Which one of the following can be a pumping length (the constant guaranteed by the pumping lemma) for L?

If L is a regular language over Σ = {a,b}, which one of the following languages is NOT regular?