CBSE 2025, Compartment, Set 4

Question

Write the following user-defined functions in Python:
(I) `push_vowels (S, St)`: Here s is a string and st is a list representing a stack. The function should push all the vowels of the string s onto the stack st. For example, if the string s is "Easy Concepts", then the function push_vowels() should push the elements "E", "a", "o", "e" onto the stack.
(II) `pop_one (St)`: The function should pop an element from the stack st, and return this element. If the stack is empty, then the function should display the message "Stack Underflow", and return None.
(III) `display_all(St)`: The function should display all the elements of the stack st, without deleting them. If the stack is empty, the function should display the message "Empty Stack".

Edvaya · Accepted Answer

The correct answer is Subjective. ```python # (I) Push Operation def push_vowels(S, St): vowels = "AEIOUaeiou" for char in S: if char in vowels: St.append(char) # (II) Pop Operation def pop_one(St): if len(St) == 0: print("Stack Underflow") return None else: return St.pop() # (III) Display all elements without popping def display_all(St): if len(St) == 0: print("Empty Stack") else: # Reversing the list for stack visualization (LIFO) for i in range(len(St)-1, -1, -1): print(St[i]) ```

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