In a linked list-based stack implementation, what does the 'isEmpty()' operation typically check?
If the stack contains any elements with a value of zero
If the tail pointer is pointing to NULL
If the stack has reached its maximum capacity
If the head pointer is pointing to NULL
If you represent an arithmetic expression in postfix notation using a stack, what operation would you perform when encountering an operand (a number)?
Push the operand onto the stack.
Check if the stack is empty.
Pop the top two elements from the stack, perform the operation, and push the result back onto the stack.
Ignore the operand.
Which of the following stack operations has a time complexity of O(1) in both array-based and linked list-based implementations?
Peek
Push
All of the above
Pop
In a stack implemented using a singly linked list, which end of the list typically represents the top of the stack?
It can be either the head or the tail, depending on the implementation.
Head
Tail
Middle
Consider the scenario of undoing actions in a text editor. Which data structure would be most suitable for implementing an 'undo' feature?
Queue
Binary Tree
Stack
Linked List
What is the primary role of a stack in expression evaluation?
Converting infix expressions to postfix.
Storing the variables used in the expression.
Performing arithmetic calculations on operands.
Evaluating the precedence of operators.
What is the time complexity of the 'peek' operation in a well-implemented stack?
O(log n)
O(1)
O(n)
O(n log n)
In a stack implemented using a linked list, where does the 'push' operation add the new element?
At a specific index in the linked list.
At the end of the linked list.
At the beginning of the linked list.
It depends on the data being inserted.
What is the primary disadvantage of implementing a stack using a fixed-size array?
Complex implementation requiring advanced pointer manipulation
Increased time complexity for push and pop operations
Higher memory usage compared to dynamic arrays
Inability to handle stacks larger than the predetermined size
What is the primary difference between 'pop' and 'peek' operations on a stack?
'Pop' retrieves the top element's value, while 'peek' removes it from the stack.
'Pop' removes the top element, while 'peek' only retrieves its value without removing it.
'Pop' and 'peek' are interchangeable terms for the same operation.
'Pop' is used for stacks, while 'peek' is used for queues.