ISRO | ISRO CS 2018 | Question 19

A doubly linked list is declared as

struct Node {
       int Value;
       struct Node *Fwd;
       struct Node *Bwd;
);

Where Fwd and Bwd represent forward and backward link to the adjacent elements of the list. Which of the following segments of code deletes the node pointed to by X from the doubly linked list, if it is assumed that X points to neither the first nor the last node of the list?

(A)

X->Bwd->Fwd = X->Fwd; X->Fwd->Bwd = X->Bwd ;

(B)

X->Bwd.Fwd = X->Fwd ; X.Fwd->Bwd = X->Bwd ;

(C)

X.Bwd->Fwd = X.Bwd ; X->Fwd.Bwd = X.Bwd ;

(D)

X->Bwd->Fwd = X->Bwd ; X->Fwd->Bwd = X->Fwd;

Answer: (A)
Explanation:

To delete a node from a doubly linked list, we need to update the links of the previous and next nodes to point to each other, effectively removing the node to be deleted from the list.

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