Queues (first-in, first-out) in Intro to Computing - Flowchart & Logic Diagram

Process Overview

A queue is a way to organize items where the first item added is the first one to be taken out. Think of it like a line at a store: the first person to get in line is the first to be served.

Flowchart

Rectangle

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Rectangle

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Rectangle

This flowchart shows how items are added to the back of the queue and removed from the front, following the first-in, first-out order.

Step-by-Step Trace - 11 Steps

Step 1: Start with an empty queue

Step 2: Add 'A' to the back of the queue (Enqueue)

Step 3: Add 'B' to the back of the queue (Enqueue)

Step 4: Check if queue is empty

Step 5: Remove item from front (Dequeue) - remove 'A'

Step 6: Process the removed item 'A'

Step 7: Check if more items to process

Step 8: Remove item from front (Dequeue) - remove 'B'

Step 9: Process the removed item 'B'

Step 10: Check if more items to process

Step 11: End

Diagram

Front -> [A] -> [B] -> [ ] <- Back

This diagram shows the queue with 'A' at the front (first to be removed) and 'B' behind it, illustrating the first-in, first-out order.

Flowchart Quiz - 3 Questions

What happens to the first item added to a queue?

A It stays in the queue forever

B It is the first to be removed

C It is the last to be removed

D It is removed randomly

Key Result

A queue always removes items in the same order they were added, like a line where the first person in is the first served.