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 ignored.
It is immediately evaluated.
Which type of linked list allows for more efficient push and pop operations at both ends, making it suitable for implementing a stack?
Circular linked list
Singly linked list
Both singly and doubly linked lists are equally efficient.
Doubly linked list
How do stacks facilitate backtracking in algorithms?
By maintaining a record of visited states and enabling the algorithm to revert to previous states.
By providing a mechanism for parallel processing.
By optimizing the search space for the algorithm.
By storing the optimal solution found so far.
How are stacks utilized in syntax parsing within compilers?
For performing code optimization.
For storing the symbol table of variables.
To generate intermediate code during compilation.
To check for matching parentheses, braces, and brackets.
Which of the following stack operations has a time complexity of O(1) in both array-based and linked list-based implementations?
Peek
Push
Pop
All of the above
What key advantage does a Deque (Double-ended Queue) offer over a Stack?
Deque allows insertions only at one end.
Deque is more memory-efficient than a Stack.
Deque allows deletions only at one end.
Deque allows insertions and deletions at both ends.
What is the primary difference between 'pop' and 'peek' operations on a stack?
'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.
'Pop' and 'peek' are interchangeable terms for the same operation.
'Pop' retrieves the top element's value, while 'peek' removes it from the stack.
If you represent an arithmetic expression in postfix notation using a stack, what operation would you perform when encountering an operand (a number)?
Check if the stack is empty.
Ignore the operand.
Pop the top two elements from the stack, perform the operation, and push the result back onto the stack.
Push the operand onto the stack.
During the infix to postfix conversion of the expression 'A+B*C-D/E', which operator would be pushed onto the stack first?
/
What is the result of evaluating the prefix expression '-+5*234'?
7
-7
-17
17