CBSE 2025, Compartment, Set 4

Question

A stack named `KeyStack` contains records of some computer keyboards. Each record is represented as a list containing Make, Keys, Connectivity. The Make and Connectivity are strings, and Keys is an integer. For example, a record in the stack may be `("Hitech", 105, "USB")`.

Write the following user-defined functions in Python to perform the specified operations on `KeyStack`:
(I) `push_key (KeyStack, new_key)`: This function takes the stack KeyStack and a new record new_key as arguments and pushes this new record onto the stack.
(II) `pop_key (KeyStack)`: This function pops the topmost record from the stack and returns it. If the stack is already empty, the function should display the message "Underflow".
(III) `isEmpty(KeyStack)`: This function checks whether the stack is empty. If the stack is empty, the function should return True, otherwise the function should return False.

Edvaya · Accepted Answer

The correct answer is Subjective. ```python # (I) Push Operation def push_key(KeyStack, new_key): KeyStack.append(new_key) # (III) IsEmpty Operation def isEmpty(KeyStack): if len(KeyStack) == 0: return True else: return False # (II) Pop Operation def pop_key(KeyStack): if isEmpty(KeyStack): print("Underflow") return None else: return KeyStack.pop() ```

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Computer Science > Computational Thinking And Programming 2 > Data Structures

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