GATE Computer Science (CS) 2021 Shift 2 Solved Paper

Question : 45 of 65

Marks: +1, -0

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\m", index, head -> value);
head = head -> next;
printf("value at index %d is %d\n", index + 1, head -> value);}}

Which one of the statement below is correct about the program ?

It has a missing return which will be reported as an error by the compiler.
It dereferences an uninitialized pointer that may result in a run-time error.
Upon execution, the program goes into an infinite loop.
Upon execution, the program creates a linked-list of five nodes.

Validate

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