In postfix evaluation, what action is taken when an operand is encountered?
It triggers the evaluation of operators on the stack.
It is pushed onto the stack.
It is immediately evaluated.
It is ignored.
What is the purpose of the 'top' pointer in an array-based stack implementation?
To track the index of the next available position for insertion
To store the value of the top element in the stack
To point to the bottom element of the stack
To store the maximum size of the stack
Which type of linked list allows for more efficient push and pop operations at both ends, making it suitable for implementing a stack?
Singly linked list
Both singly and doubly linked lists are equally efficient.
Circular linked list
Doubly linked list
In a linked list-based stack implementation, what does the 'isEmpty()' operation typically check?
If the tail pointer is pointing to NULL
If the stack has reached its maximum capacity
If the stack contains any elements with a value of zero
If the head pointer is pointing to NULL
What is the result of evaluating the prefix expression '-+5*234'?
-7
-17
7
17
Which of the following operations is NOT typically associated with a Deque?
inject (insert at the front)
push (insert at the rear)
peek (view the element at the front without removing)
pop (remove from the rear)
What key advantage does a Deque (Double-ended Queue) offer over a Stack?
Deque allows insertions and deletions at both ends.
Deque is more memory-efficient than a Stack.
Deque allows deletions only at one end.
Deque allows insertions only at one end.
How do stacks facilitate backtracking in algorithms?
By providing a mechanism for parallel processing.
By storing the optimal solution found so far.
By maintaining a record of visited states and enabling the algorithm to revert to previous states.
By optimizing the search space for the algorithm.
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' and 'peek' are interchangeable terms for the same operation.
'Pop' removes the top element, while 'peek' only retrieves its value without removing it.
'Pop' is used for stacks, while 'peek' is used for queues.
You need to implement a stack that can store a large number of items and the maximum number of items is unknown. Which implementation would be more suitable?
Stack using a doubly linked list
Stack using a singly linked list
Stack using a fixed-size array
Stack using a dynamic array