Gate CS-2010 Question Paper With Solutions

Q. 48 The following C function takes a singly-linked list as input argument. It modified
the list by moving the last element to the front of the list and returns the modified
list. Some part of the code is left blank.

typedef struct node  
 {   
 int value;   
 struct node *next;  }
Node;     Node *move_to_front(Node *head)  
 {    Node *p, *q;   
 if ((head == NULL: || (head->next == NULL))  
     return head;    q = NULL; p = head;    while (p-> next !=NULL)     {   
   q = p;     
 p = p->next;    }    _______________________________    
return head; 
 } 

Choose the correct alternative to replace the blank line.

Answer: (D)

Explanation: