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Digital ElectronicsSigned Arithmetic

In two’s-complement addition, overflow can be detected by XORing which two carry signals?

  • ACarry into and carry out of the sign bit
  • BCarry into bit 0 and bit 1
  • CTwo successive clock carries
  • DCarry out and borrow out
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Correct Answer: A. Carry into and carry out of the sign bit
Explanation: For two's-complement addition, overflow equals the XOR of the carry into the most significant sign bit and the carry out of that bit.
Reference: Standard digital electronics: overflow detection
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