GATE | GATE CS 2021 | Set 2 | Question 45

Consider the following ANSI C program:

#include < stdio.h >
#include < stdlib.h >
struct Node{
        int value;
        struct Node *next;};
int main( ) {
    struct Node *boxE, *head, *boxN; int index=0;
    boxE=head= (struct Node *) malloc(sizeof(struct Node));
    head → value = index;
    for (index =1; index<=3; index++){
        boxN = (struct Node *) malloc (sizeof(struct Node));
        boxE → next = boxN;
        boxN → value = index;
        boxE = boxN; }
for (index=0; index<=3; index++) {
    printf(“Value at index %d is %d\\n”, index, head → value);
    head = head → next;
    printf(“Value at index %d is %d\\n”, index+1, head → value); } } 

Which one of the following statements below is correct about the program?

(A)

(B)

(C)

(D)