In the context of expression parsing, what role does a stack play?
Generating machine code from the expression.
Optimizing the expression for better performance.
Evaluating the parsed expression directly.
Storing the lexical tokens identified in the expression.
If you represent an arithmetic expression in postfix notation using a stack, what operation would you perform when encountering an operand (a number)?
Ignore the operand.
Push the operand onto the stack.
Pop the top two elements from the stack, perform the operation, and push the result back onto the stack.
Check if the stack is empty.
In maze-solving algorithms, how does the use of a stack differ between depth-first search (DFS) and breadth-first search (BFS)?
BFS uses a stack to prioritize unexplored paths, while DFS uses a queue to systematically explore all directions.
Both DFS and BFS use stacks identically; the difference lies in how they mark visited nodes.
DFS uses a stack to explore as deeply as possible before backtracking, while BFS uses a queue to explore all neighbors at a given level.
DFS uses a stack only if the maze is solvable, while BFS always uses a queue.
What is the purpose of the 'top' pointer in an array-based stack implementation?
To store the value of the top element in the stack
To track the index of the next available position for insertion
To store the maximum size of the stack
To point to the bottom element of the stack
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.
In postfix evaluation, what action is taken when an operand is encountered?
It is pushed onto the stack.
It triggers the evaluation of operators on the stack.
It is immediately evaluated.
It is ignored.
Imagine a stack is used to track function calls in a recursive program. What happens to the stack when a function returns?
The corresponding function call is popped from the stack.
The entire stack is cleared.
The corresponding function call is pushed onto the stack.
The stack remains unchanged.
During the infix to postfix conversion of the expression 'A+B*C-D/E', which operator would be pushed onto the stack first?
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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 singly linked list
Stack using a fixed-size array
Stack using a dynamic array
Stack using a doubly linked list
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
Circular linked list
Both singly and doubly linked lists are equally efficient.
Doubly linked list