ISRO | ISRO CS 2013 | Question 11

When two BCD numbers 0x14 and 0x08 are added what is the binary representation of the resultant number?
(A) 0x22
(B) 0x1c
(C) 0x16
(D) results in overflow


Answer: (A)

Explanation: BCD numbers are binary coded decimal numbers in which each digit of a number is separately represented as a 4-bit binary number.

BCD Representation of 0x14 = 0001  0100 
BCD Representation of 0x08 = 0000  1000
                            ------------
                  Addition = 0001  1100

In BCD addition, if a digit > 9, add 6 to it.
                        so, 0001  1100
                           +0000  0110
                          --------------
                            0010  0010   

So in BCD addition, the resultant number is 22.

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