Question

Write a menu driven python program using queue, to implement movement of shuttlecock in it’s box.

Answer 1

# Queue Implementation 
 def clearScreen():
     print("\n"*12)
  
 def isEmpty(que):
     if que == []:
         return True
     else:
         return False
  
 def ENQUEUE(que, item):
     que.append(item)
     if len(que) == 1:
         front = rear = 0
     else:
         rear = len(que) - 1
  
 def DEQUEUE(que):
     if isEmpty(que):
         return "UNDERFLOW"
     else:
         item = que.pop(0)   #remove element at index position 0
         if len(que) == 0:
             front = rear = None
         
         return item
  
 def PEEK(que):
     if isEmpty(que):
         return "UNDERFLOW"
     else:
         front = 0
         return que[front]
  
 def DISPLAY(que):
     if isEmpty(que):
         print(" Queue is EMPTY")
     elif len(que)== 1:
         print(que[0], "<= front, rear")
     else:
         front = 0
         rear = len(que) - 1
         print(que[front], '<- front')
         for i in range(1, rear):
             print(que[i])
         print(que[rear], '<- rear')
  
  
 Queue = [] #Empty Queue
 #front = rear = None
 while True:
     
     print("QUEUE MENU")
     print("1. ENQUEUE")
     print("2. DEQUEUE")
     print("3. Peek")
     print("4. Display")
     print("5. Exit")
     clearScreen()
     option = int(input("Enter your choice (1-5) : "))
     if option == 1:
         item = int(input("Enter Shuttlecock Number :: "))
         ENQUEUE(Queue, item)
         input("Press Enter to continue....")
         
     elif option == 2:
         item = DEQUEUE(Queue)
         if item == "UNDERFLOW":
             print("Underflow !")
         else:
             print(item , 'Shuttlecock is dequeue-ed')
         input("Press Enter to continue....")
         
     elif option == 3:
         item = PEEK(Queue)
         if item == "UNDERFLOW":
             print("Underflow !")
         else:
             print("Front most Shuttlecock is ",item)
         input("Press Enter to continue....")
         
     elif option == 4:
         DISPLAY(Queue)
         input("Press Enter to continue....")
     elif option == 5:
         break
     else:
         print("Invalid Choice!")
         input("Press Enter to continue....")