Question 30 (ii) - Teachoo Sample Paper - Computer Science Class 12 - Solutions to CBSE Sample Paper - Computer Science Class 12

(ii) Pop_element(): It pops the objects from the stack and displays them. Also, the function should display “Stack Empty” when there are no elements in the stack.

For example: If the nested list contains the following data:

BList=[["The Alchemist", "Paulo Coelho", 250],

["Animal Farm", "George Orwell", 150],

["The Da Vinci Code", "Dan Brown", 350],

["Harry Potter", "J.K. Rowling", 400],

["The Kite Runner", "Khaled Hosseini", 270],

["The Catcher in the Rye", "J.D. Salinger", 200]]

The stack should contain:

['The Alchemist', 'Paulo Coelho'], 

['Animal Farm', 'George Orwell'], 

['The Catcher in the Rye', 'J.D. Salinger']

The output should be:

['The Catcher in the Rye', 'J.D. Salinger']

['Animal Farm', 'George Orwell']

['The Alchemist', 'Paulo Coelho']

Stack Empty

Answer:

Answer by student

Detailed answer by teachoo

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The code defines a function named Pop_element that takes no parameters and pops and displays the elements from the stack until it is empty. The function performs the following steps:

• • It loops until the books list (which represents the stack) is empty using a while loop. The condition for this loop is simply books, which evaluates to True if books is not empty and False if books is empty.
  • It pops and displays the top element of the stack using the pop and print methods . The pop method removes and returns the last element of the books list, which represents the top of the stack. The print method displays this element on the screen.
  • After the loop ends, it displays “Stack Empty” using the print method . This indicates that there are no more elements in the stack.

The final code is:

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