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Digital ElectronicsSigned Arithmetic

For an 8-bit two’s-complement number, what decimal value is represented by 10000000₂?

  • A-128
  • B-127
  • C+128
  • D0
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Correct Answer: A. -128
Explanation: In 8-bit two's-complement representation the range is −128 to +127, and the code 10000000 represents the minimum value, −128.
Reference: Standard digital electronics: two's-complement representation
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