Class 12 Computer Science — Chapter 4: Queue

What you'll learn

• ▸FIFO Principle and Queue Definition
• ▸Applications of Queues
• ▸Core Queue Operations: ENQUEUE and DEQUEUE
• ▸Helper Queue Operations
• ▸Visualizing Queue State Changes
• ▸Implementing Queue using Python List
• ▸Python Functions for Queue Helper Operations

Chapter Summary

--- PAGE 1 --- --- PAGE 2 --- NOTES Petrol Pump Figure 4.2: Queue of cars in a petrol pump 4.1.1 First In First Out (FIFO) Queue follows the principle of First In First Out (FIFO), since the element entering first in the queue will be the first one to come out of it. Thus, the element that has been longest in the queue will be removed first. It is also known as a First Come First Served (FCFS) approach. Queue i…

Practice Questions from this Chapter

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1. Explain a queue's real-life examples. Get Solution →
2. Show how queues work in computers. Get Solution →
3. Describe FIFO's difference from LIFO. Get Solution →
4. What does the acronym FIFO stand for in the context of queues? Get Solution →
5. Which operation is used to add a new element to the REAR of a queue? Get Solution →
6. What is the term for the end of the queue from which elements are removed? Get Solution →
7. What is another name for the FIFO principle? Get Solution →
8. What exception occurs if you try to perform a DEQUEUE operation on an empty queue? Get Solution →

Did you know?

• 💡 Over a million people waited to see Vladimir Lenin's body in 1924.
• 💡 Ants form orderly queues using pheromone trails to find food efficiently.
• 💡 During World War II, many people queued for hours daily to get food rations.
• 💡 Queuing theory, a math branch, helps design efficient traffic flow and call centers.
• 💡 People perceive waiting as shorter when they are entertained or have something to do.

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