Question: Which operation is not allowed in a stack?
Options:
Push
Pop
Peek
Dequeue
Correct Answer: Dequeue
Solution:
Dequeue is not allowed in a stack as it is a queue operation; stacks only allow push, pop, and peek operations.
Which operation is not allowed in a stack?
Practice Questions
Q1
Which operation is not allowed in a stack?
Push
Pop
Peek
Dequeue
Questions & Step-by-Step Solutions
Which operation is not allowed in a stack?
Step 1: Understand what a stack is. A stack is a data structure that follows the Last In, First Out (LIFO) principle.
Step 2: Learn the basic operations of a stack. The main operations are 'push' (to add an item), 'pop' (to remove the top item), and 'peek' (to view the top item without removing it).
Step 3: Identify what a queue is. A queue is a different data structure that follows the First In, First Out (FIFO) principle.
Step 4: Know the operations of a queue. The main operations of a queue are 'enqueue' (to add an item) and 'dequeue' (to remove the front item).
Step 5: Compare the operations of stacks and queues. Notice that 'dequeue' is an operation specific to queues and is not allowed in stacks.
Step 6: Conclude that 'dequeue' is the operation that is not allowed in a stack.
No concepts available.
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