Consider the C code fragment given below gate computer science 2017

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GATE-Computer-Science-Engineering-2017-->View question

Consider the C code fragment given below. -gate computer science 2017

typedef struct node
    int data;
    node* next ;
} node;

void join(node* m, node* n)
    node* p = n;
    while (p->next != NULL)
        p = p->next;
    p–>next = m;
Assuming that m and n point to valid NULL- terminated linked lists, invocation of join will :- 
A) append list m to the end of list n for all inputs
B) either cause a null pointer dereference or append list m to the end of list n
C) cause a null pointer dereference for all inputs.
D) append list n to the end of list m for all inputs.

B) either cause a null pointer dereference or append list m to the end of list n
As it is stated in the question, that m and n are valid Lists but not explicitly specified if the lists are empty or not. We can have two cases:
Case 1: If lists are not NULL : Invocation of join will append list m to the end of list n if the lists are not NULL. For Example:Before join operation : m =1->2->3->4->5->null n =6->7->8->9->nullAfter join operation : 6->7->8->9->1->2->3->4->5->null
Case 2: If lists are NULL : If the list n is empty and itself NULL, then joining and referencing would obviously create NULL pointer issue.
Therefore option B is correct

Answerd By:deepuckraj

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