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CBSE Class 12 Computer Science Question 22 of 26

Data Structures in Python — Question 23

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23
Question

Question 22

Write a program to insert or delete an element from a Queue depending upon the user's choice. The elements are not shifted after insertion or deletion.

Solution
def enqueue(queue):
    element = input("Enter the element to enqueue: ")
    queue.append(element)  

def dequeue(queue):
    if queue:
        removed_element = queue.pop(0) 
        print("Dequeued element:", removed_element)
    else:
        print("Queue is empty")

queue = []

while True:
    print("QUEUE OPERATIONS")
    print("1. Enqueue element")
    print("2. Dequeue element")
    print("3. Exit")
    choice = input("Enter your choice (1-3): ")

    if choice == '1':
        enqueue(queue)
    elif choice == '2':
        dequeue(queue)
    elif choice == '3':
        print("Exiting program")
        break
    else:
        print("Invalid choice. Please enter a valid option.")
Output
QUEUE OPERATIONS
1. Enqueue element
2. Dequeue element
3. Exit
Enter your choice (1-3): 1
Enter the element to enqueue: 4
QUEUE OPERATIONS
1. Enqueue element
2. Dequeue element
3. Exit
Enter your choice (1-3): 1
Enter the element to enqueue: 8
QUEUE OPERATIONS
1. Enqueue element
2. Dequeue element
3. Exit
Enter your choice (1-3): 1
Enter the element to enqueue: 12
QUEUE OPERATIONS
1. Enqueue element
2. Dequeue element
3. Exit
Enter your choice (1-3): 2
Dequeued element: 4
QUEUE OPERATIONS
1. Enqueue element
2. Dequeue element
3. Exit
Enter your choice (1-3): 3
Exiting program
Answer

def
enqueue
(
queue
):
element
=
input
(
"Enter the element to enqueue: "
)
queue
.
append
(
element
)
def
dequeue
(
queue
):
if
queue
:
removed_element
=
queue
.
pop
(
0
)
print
(
"Dequeued element:"
,
removed_element
)
else
:
print
(
"Queue is empty"
)
queue
=
[]
while
True
:
print
(
"QUEUE OPERATIONS"
)
print
(
"1. Enqueue element"
)
print
(
"2. Dequeue element"
)
print
(
"3. Exit"
)
choice
=
input
(
"Enter your choice (1-3): "
)
if
choice
==
'1'
:
enqueue
(
queue
)
elif
choice
==
'2'
:
dequeue
(
queue
)
elif
choice
==
'3'
:
print
(
"Exiting program"
)
break
else
:
print
(
"Invalid choice. Please enter a valid option."
)
Output
QUEUE OPERATIONS
1. Enqueue element
2. Dequeue element
3. Exit
Enter your choice (1-3): 1
Enter the element to enqueue: 4
QUEUE OPERATIONS
1. Enqueue element
2. Dequeue element
3. Exit
Enter your choice (1-3): 1
Enter the element to enqueue: 8
QUEUE OPERATIONS
1. Enqueue element
2. Dequeue element
3. Exit
Enter your choice (1-3): 1
Enter the element to enqueue: 12
QUEUE OPERATIONS
1. Enqueue element
2. Dequeue element
3. Exit
Enter your choice (1-3): 2
Dequeued element: 4
QUEUE OPERATIONS
1. Enqueue element
2. Dequeue element
3. Exit
Enter your choice (1-3): 3
Exiting program