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The first thing to remember is that a BCD digit is only 4 bits (a nibble).

Secondly BCD is a base 10 system so the largest number for each digit is 9 but a nibble can have a value of up to 15.

Thirdly, after each addition the resulting value has to be normalized. Here is the rule. If the resulting value is grater than 9, subtract 10 and also carry 1.

Programming this is your job.

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Q: How do you write a program on bcd addtion?
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