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

• Last Updated : 26 Dec, 2019

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

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 → 7000 → 7
X = 7

So, option (C) is correct.

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