Question

The weights used in Binary coded decimal code are:

(a) 4,2,1

(b) 8,4,2,1

(c) 6,4,2,1

(d) 2,1

The question was asked by my school teacher while I was bunking the class.

My question is based upon BCD topic in portion Computer Codes of Computer Fundamentals

Answer 1

The correct answer is (b) 8,4,2,1

The best explanation: BCD is a weighted code and it uses the weights 8,4,2,1 respectively. It is often called the 8421 code. Since, it uses 4 bits for the representation therefore the weights are assigned as : 2^3 = 8, 2^2 = 4, 2^1 = 2, 2^0 = 1.