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CBSE Class 12 Computer Science Question 6 of 26

Data Structures in Python — Question 7

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7
Question

Question 7

Write an interactive menu-driven program implementing Stack using list. The list is storing numeric data.

Solution
def push(num):
    h = int(input("Enter a number: "))
    num.append(h)

def pop(num):
    if len(num) == 0:
        print("No number to delete")
    else:
        print("Deleted number is:", num.pop())

def display(num):
    print(num)

num = []
while True:
    print("1. Add number")
    print("2. Delete number")
    print("3. Display numbers")
    print("4. Exit")
    op = int(input("Enter the Choice: "))
    if op == 1:
        push(num)
    elif op == 2:
        pop(num)
    elif op == 3:
        display(num)
    elif op == 4:
        print("Exiting program.")
        break
    else:
        print("Invalid choice. Please enter a number between 1 and 4.")
Output
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 1
Enter a number: 2
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 1
Enter a number: 4
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 1
Enter a number: 6
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 1
Enter a number: 8
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 3
[2, 4, 6, 8]
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 2
Deleted number is: 8
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 3
[2, 4, 6]
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 4
Exiting program.
Answer

def
push
(
num
):
h
=
int
(
input
(
"Enter a number: "
))
num
.
append
(
h
)
def
pop
(
num
):
if
len
(
num
)
==
0
:
print
(
"No number to delete"
)
else
:
print
(
"Deleted number is:"
,
num
.
pop
())
def
display
(
num
):
print
(
num
)
num
=
[]
while
True
:
print
(
"1. Add number"
)
print
(
"2. Delete number"
)
print
(
"3. Display numbers"
)
print
(
"4. Exit"
)
op
=
int
(
input
(
"Enter the Choice: "
))
if
op
==
1
:
push
(
num
)
elif
op
==
2
:
pop
(
num
)
elif
op
==
3
:
display
(
num
)
elif
op
==
4
:
print
(
"Exiting program."
)
break
else
:
print
(
"Invalid choice. Please enter a number between 1 and 4."
)
Output
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 1
Enter a number: 2
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 1
Enter a number: 4
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 1
Enter a number: 6
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 1
Enter a number: 8
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 3
[2, 4, 6, 8]
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 2
Deleted number is: 8
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 3
[2, 4, 6]
1. Add number
2. Delete number
3. Display numbers
4. Exit
Enter the Choice: 4
Exiting program.