GATE | Sudo GATE 2020 Mock I (27 December 2019) | Question 33

Consider the following linked list :  
S is the header pointer and P is an empty pointer. Perform given operations in sequence in this linked list:

(i) P = S → next → next → next 
(ii) P → next → next → next → next = S → next → next → next → next
(iii) S → next → next → next = P → next → next
(iv) X = S → next → next → next → next → next → next → next → data 

What will be the value of X?

(A)

5

(B)

6

(C)

7

(D)

Segmentation Error

Answer: (C)
Explanation:

Final linked list will be as given below after performing given operation in sequence:

(i) P = S → next → next → next 
P = 1000 → 2000 → 3000 → 4000
 
(ii) P → next → next → next → next = S → next → next → next → next
P → 5000 → 6000 → 7000 → null = S → 2000 → 3000 → 4000 → 5000

(iii) S → next → next → next = P → next → next 
S → 2000 → 3000 → 4000 = P → 5000 → 6000 

Therefore, value of X will be:

X = S → next → next → next → next → next → next → next → data 

X = 1000 → 2000 → 3000 → 6000 → 7000 → 5000 → 6000 →6 X = 7 So, option (B) is correct.

Quiz of this Question
Please comment below if you find anything wrong in the above post