In postfix evaluation, what action is taken when an operand is encountered?
It is immediately evaluated.
It is pushed onto the stack.
It triggers the evaluation of operators on the stack.
It is ignored.
In a stack implemented using a singly linked list, which end of the list typically represents the top of the stack?
Middle
Tail
It can be either the head or the tail, depending on the implementation.
Head
What is the result of evaluating the prefix expression '-+5*234'?
-17
7
17
-7
Consider the scenario of undoing actions in a text editor. Which data structure would be most suitable for implementing an 'undo' feature?
Binary Tree
Stack
Queue
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 optimizing the search space for the algorithm.
By storing the optimal solution found so far.
By providing a mechanism for parallel processing.
What is a potential drawback of using a linked list-based stack compared to an array-based stack?
Inability to handle dynamic resizing
Limited stack size
Higher memory usage due to the overhead of storing pointers
Increased time complexity for push and pop operations
How are stacks utilized in syntax parsing within compilers?
To check for matching parentheses, braces, and brackets.
For storing the symbol table of variables.
To generate intermediate code during compilation.
For performing code optimization.
What is the primary disadvantage of implementing a stack using a fixed-size array?
Inability to handle stacks larger than the predetermined size
Higher memory usage compared to dynamic arrays
Complex implementation requiring advanced pointer manipulation
What is the primary role of a stack in expression evaluation?
Evaluating the precedence of operators.
Converting infix expressions to postfix.
Performing arithmetic calculations on operands.
Storing the variables used in the expression.
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
Doubly linked list
Circular linked list
Both singly and doubly linked lists are equally efficient.