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Digital ElectronicsBCD Arithmetic

Two BCD digits 0101 and 0111, representing decimal 5 and 7, are added. After BCD correction, the two-digit BCD result is?

  • A0001 0010
  • B0000 1100
  • C0010 0001
  • D0001 0110
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Correct Answer: A. 0001 0010
Explanation: 5+7=12. The initial binary sum 1100 is invalid BCD, so adding 0110 gives 1 0010. Thus the BCD result is 0001 0010, representing decimal 12.
Reference: Standard digital electronics: BCD correction
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