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Which of the following problems CANNOT be solved using the bitwise sum approach (XOR and AND without '+')?

easy🔍 Pattern Recognition Q2 of Q15
Bit Manipulation - Sum of Two Integers Without + Operator
Which of the following problems CANNOT be solved using the bitwise sum approach (XOR and AND without '+')?
AMultiply two integers without using '*' or '+' operators
BSimulate addition of two integers handling carry bits explicitly
CAdd two integers without using '+' operator
DCalculate the sum of an array of integers without '+' operator
Step-by-Step Solution
Solution:

  1. Step 1: Analyze each problem

    Options A, B, and D relate to addition; bitwise sum directly applies to addition.

  2. Step 2: Identify anti-pattern

    Multiplication without '*' or '+' requires repeated addition or shifts, but bitwise sum alone cannot directly multiply.

  3. Final Answer:

    Option A -> Option A

  4. Quick Check:

    Bitwise sum handles addition, not multiplication [OK]
Quick Trick: Bitwise sum can't directly multiply integers [OK]
Common Mistakes:
MISTAKES
  • Assuming multiplication can be done with just bitwise sum
Trap Explanation:
PITFALL
  • Candidates confuse addition and multiplication, thinking bitwise sum covers both.
Interviewer Note:
CONTEXT
  • Tests anti-pattern recognition and problem suitability
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