Question 4 - Past Year - 2 Mark Questions - Chapter 3 - Stacks

Write a program to print a string in reverse order.

Answer:

To print a string in reverse order, first insert each character of the string into a stack. Then, delete each element from the top of the stack and print the deleted element.

Code:

def push(rev,x):

rev.append(x)

return

def pop(rev):

if len(rev)==0:

print("Stack is empty")

else:

deleted_element=rev.pop()

return deleted_element

rev_stack=[]

input_string=input("Enter a string to be reversed: ")

for a in input_string:

push(rev_stack,a)

print("Reversed string: ")

for i in input_string:

x=pop(rev_stack)

print(x)

Output:

Enter a string to be reversed: welcome

Reversed string:

e

m

o

c

l

e

w