We append another XOR gates to alter Subtrahend. The reason is, in logic subtraction is adding 2’s complement of a number. So that is why we employed a full-adder and XOR gate to subtract. Lastly as ...

4-Bit Full-Adder with Fast Carry and some logic to drive two 7 ... Before getting into details of the working principle lets see the pin diagram of 7-Segment Display also as we are using common anode ...