Qes - to the first bit is 0 If S =1 then it will behave as...

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Q. 1 How to implement Adder and Subtracter by using single circuit? Ans: Take one selection input i.e. S and connect this to the first bit of the circuit. Also connect this S input along with B input to a XOR gate and output of the XOR gate connect to circuit for input B. Now if S = 0 circuit will behave as Adder. (It will not change the B value and the carry in
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Unformatted text preview: to the first bit is 0) If S =1 then it will behave as a Subtractor. (B input will be complemented with the help of XOR gate and carry in to the first bit of the circuit is 1 so in it gives two's complement of the input B) Above logic you can implement for more than one bit as well....
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