Question

In Python

1. Use a queue structure from C++ STL and populate it with at least five names (string type). Print the content of this queue using a stack (from C++ STL). If you are using a language other than C++, the you may use the built-in queue and stack structures in that language.

Answer 1

SOURCE CODE:

import queue #importing queue module which provides implementations of stack and queue
N=0
while True:
N=int(input("Enter length of the queue atleast 5: ")) #reading length of queue from user
#validating user input (i.e length must be greater than or equal to 5)
  
if(N<5): #if length less than 5 then   
print("Invalid!Please Enter Again") #printing error message
else:
break

Q=queue.Queue(N) #Creating Queue object with size N
print("Enter strings to store in Queue:-")
for i in range(N):
el=input() #reading elements from the user
Q.put(el) #appending that elements to Q
  

Stack=queue.LifoQueue(N) #Creating object of LifoQueue(i.e, Stack) with size N

Size=Q.qsize() #storing Q size in the Size variable
for i in range(Size): #iterating upto Size
Stack.put(Q.get()) #Dequeing element from the Queue and pushing to the stack
  
print("The elements of the Queue using Stack are:-")
Size=Stack.qsize() #storing stack size in the Size variable
for i in range(Size): #iterating upto Size
print(Stack.get()) #popping element form the Stack and printing on the screen
  

CODE SCREENSHOT:   

  
OUTPUT: