1. In general, how useful is the Queue data structure? Can you think of other data...
1. In general, how useful is the Queue data structure? Can you think of other data structure?
2. If we didn’t have the Queue data structure, can you think of another way to implement the FIFO (first in first out) concept?
Can the Queue ADT accept/handle null entries? Why or why not?
Homework Answers
1. The Queue data structure is used in a number of ways:
- It is used in Breadth First Search for Graphs to store the neighbouring edges
- It is used in CPU and Disk scheduling
- It is used in Interrupt Handling in real-time systems
A data structure similar to Queue is Stack, the only difference being Queue is First In First Out but Stack is First In Last Out.
2. We can implement a Queue using two Stacks. In case of enqueue, we push the data into the first Stack. In case of dequeue, we pop all elements from first Stack and push them into the second Stack. This reverses the Stack, ensuring that we pop the first element entered. We pop from the second Stack, and push the remaining of the elements in the second Stack to the first Stack.
A Queue can not handle null entries, the reason being that if null entries are accepted it will be impossible to tell if the Queue is empty or there is a null entry at the front of the Queue.
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