Insert at End Tail Insert in DSA C - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new node for insertion at the end.

DSA C

struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
newNode->data = [1];
newNode->next = NULL;

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Ahead

Bdata

Cvalue

Dtemp

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong variable name for the data field.

Not setting the next pointer to NULL.

We assign the value to the new node's data field before inserting it at the end.

2fill in blank

medium

Complete the code to handle the empty list case when inserting at the end.

DSA C

if (head == NULL) {
    head = [1];
    return head;
}

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Anode

BnewNode

Ctemp

DNULL

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning head to NULL instead of the new node.

Using an undefined variable.

If the list is empty, the new node becomes the head of the list.

3fill in blank

hard

Fix the error in the loop that finds the last node for insertion.

DSA C

struct Node* temp = head;
while (temp->[1] != NULL) {
    temp = temp->next;
}

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Anext

Bprev

Cdata

Dhead

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'prev' or 'data' instead of 'next' in the loop condition.

Incorrect loop condition causing infinite loop.

To find the last node, we check the next pointer until it is NULL.

4fill in blank

hard

Fill both blanks to correctly link the new node at the end.

DSA C

struct Node* temp = head;
while (temp->[1] != NULL) {
    temp = temp->next;
}
temp->[2] = newNode;

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Anext

Bprev

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'prev' or 'data' instead of 'next'.

Not linking the new node properly.

We traverse using 'next' and then link the last node's next to the new node.

5fill in blank

hard

Fill all three blanks to complete the tail insertion function.

DSA C

struct Node* insertAtEnd(struct Node* head, int value) {
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    newNode->data = [1];
    newNode->next = NULL;
    if (head == NULL) {
        head = [2];
        return head;
    }
    struct Node* temp = head;
    while (temp->[3] != NULL) {
        temp = temp->next;
    }
    temp->next = newNode;
    return head;
}

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Avalue

BnewNode

Cnext

Dhead

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names.

Not setting newNode->next to NULL.

Incorrect loop condition.

Assign the value to newNode->data, set head to newNode if empty, and traverse using next pointer.