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Questions and Answers
What is a common disadvantage of recursive methods as outlined in the text?
What is a common disadvantage of recursive methods as outlined in the text?
- Ease of implementation
- Memory efficiency (correct)
- Speed optimization
- Logic simplicity
Why can recursion be slow if not implemented correctly?
Why can recursion be slow if not implemented correctly?
- Excessive use of loops
- Lack of conditional statements
- Overloading the stack with recursive calls (correct)
- Difficulty in logic construction
What is the purpose of the stack access method isEmpty()?
What is the purpose of the stack access method isEmpty()?
- To check if the stack is empty (correct)
- To add items to the stack
- To remove items from the stack
- To check if the stack is full
In the context of the TOWNS stack, why is the isEmpty() method important?
In the context of the TOWNS stack, why is the isEmpty() method important?
Why might a recursive function be difficult to analyze or understand?
Why might a recursive function be difficult to analyze or understand?
What is a potential consequence of recursion being memory-intensive?
What is a potential consequence of recursion being memory-intensive?
How does recursion impact CPU task scheduling?
How does recursion impact CPU task scheduling?
What role does the stack access method isEmpty() play in interrupt handling?
What role does the stack access method isEmpty() play in interrupt handling?
Why does recursion pose challenges in print queue management?
Why does recursion pose challenges in print queue management?
How does recursion influence the handling of interrupts?
How does recursion influence the handling of interrupts?
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Study Notes
Memory Address Register (MAR)
- Holds the address of the current instruction/data that is to be fetched from/transferred to memory.
Applications of Queues in Computing
- Print queue (serving requests on a shared printer) / spooling in printer
- CPU task scheduling
- Handling of interrupts (in the same order as they arrive)
- Buffer for devices like keyboard
- Queues in routers/switches
- Mail queues
- Simulation/computer modelling of physical queues (e.g. customer waiting line in a supermarket queue)
- Handling website traffic/network congestion
- Maintaining playlist in media player
Binary Trees
- Leaf nodes: nodes with no children (e.g. 4, 7, 9 in the given binary tree)
- Preorder traversal: 6, 3, 5, 4, 8, 7, 9
- Resulting binary tree after deletion of the root node:
- Correct root node
- Correct left subtree
- Correct right subtree
Recursive Methods
- Disadvantages:
- Recursion is memory intensive (uses memory to store intermediate arguments and return values)
- Recursion can be slow (if not implemented correctly or with too many recursive calls)
- Difficult to think of the logic of a recursive function
- Hard to construct/analyse/understand the code
Stack Data Structure
- Used in the implementation of recursive methods
- Purpose of the stack access method isEmpty():
- Returns a Boolean value indicating whether the stack is empty
- Used to check if the stack is empty before performing operations
- Prevents performing operations on an empty stack/stack underflow error
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