Question

The code where all successive numbers differ from their preceding number by single bit is __________

(a) Alphanumeric Code

(b) BCD

(c) Excess 3

(d) Gray

The question was asked during an interview for a job.

I'd like to ask this question from Logic Gates and Networks in division Boolean Algebra and Minimization Techniques and Logic Gates of Digital Circuits

Answer 1

Correct answer is (d) Gray

For explanation I would say: The code where all successive numbers differ from their preceding number by single bit is gray code. It is an unweighted code. The most important characteristic of this code is that only a single bit change occurs when going from one code number to next. BCD Code is one in which decimal digits are represented by a group of 4-bits each, whereas, in Excess-3 Code, the decimal numbers are incremented by 3 and then written in their BCD format.