Bit Manipulation - Reverse Bits
What is the output of the optimal bit reversal code when input n = 0 (all bits zero)?
What is the output of the optimal bit reversal code when input n = 0 (all bits zero)?
medium🧾 Code Trace Q4 of Q15
Step-by-Step Solution
Solution:
Step 1: Analyze input
Input n=0 means all bits are zero.Step 2: Trace bit reversal
Reversing zero bits results in zero.Final Answer:
Option B -> Option BQuick Check:
Reversing zero bits yields zero [OK]
Quick Trick: Reversing zero bits should yield zero [OK]
Common Mistakes:
MISTAKES- Assuming output always zero for input zero
- Ignoring unsigned shift behavior
Trap Explanation:
PITFALL- Candidates may overlook how shifts and masks affect zero input, causing unexpected output.
Interviewer Note:
CONTEXT- Tests edge case handling and understanding of bitwise operations.
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