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Excess 3 Code Addition and Subtraction

Excess 3 Code

Before discussing the BCD addition and subtraction using Excess 3 code we have to know what is Excess 3 code. It is a basically a binary code which is made by adding 3 with the equivalent decimal of a binary number and again converting it into binary number. So if we consider any binary number we have to first convert it into decimal number then add 3 with it and then convert it into binary and we will get the excess 3 equivalent of that number. Now we will see how BCD addition and subtraction can be done by this method.
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