[Solved] Find the bug in this code:class Piece: def move(self): return "Moving" class Rook(Piece): def move(self): print("Rook moves straight") r = Rook() result = r.move() print(result) | LLD

LLD - Design — Chess Game

Find the bug in this code:

class Piece:
    def move(self):
        return "Moving"

class Rook(Piece):
    def move(self):
        print("Rook moves straight")

r = Rook()
result = r.move()
print(result)

ARook.move() should return a string, not print it.

BBase class move() should print, not return.

CNo bug; code works as expected.

DRook class should not override move().

Step-by-Step Solution

Solution:

Step 1: Analyze Rook.move() method
Rook.move() prints a message but does not return anything, so returns None by default.
Step 2: Check usage of move() return value
result = r.move() assigns None, so print(result) outputs None, which is likely unintended.
Final Answer:
Rook.move() should return a string, not print it. -> Option A
Quick Check:
Override should match base method return type [OK]

Quick Trick: Override methods should return expected values, not just print [OK]

Common Mistakes:

MISTAKES

Confusing print with return
Ignoring return value usage
Assuming no bug if output appears

Master "Design — Chess Game" in LLD

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Arch Try Challenge Design Recall Scale

More LLD Quizzes

Find the bug in this code:

Step 1: Analyze Rook.move() method

Step 2: Check usage of move() return value

Final Answer:

Quick Check:

Want More Practice?