MCQ Practice Question

Digital Electronics Number Systems & Codes

Which useful property does the Excess-3 decimal code possess?

AIt is self-complementing
BIt uses only three bits per decimal digit
CIt is a weighted 8421 code
DAdjacent values always differ by one bit

Correct Answer: A. It is self-complementing

Explanation: Excess-3 is a self-complementing code: complementing all four bits of a digit code gives the Excess-3 code for the 9's complement of that decimal digit.

Reference: Standard digital electronics: Excess-3 properties