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I can't seem to solve this problem. Already, I'm little confused because of using half adder and half subtractor. I have tried to draw then stuck. How can I make the operation by half adder and half subtractor ? Could someone explain me solution ? Operation is $$ (w+x)-(y+z) $$ enter image description here

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  • \$\begingroup\$ Start with a truth table. Perhaps it is two half adders an d a subtractor? \$\endgroup\$ – Eugene Sh. Apr 25 '15 at 13:55
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For subtraction operation one has to add 2's compliment. you would require Cout to be connected to inverter and add 1 carry. I dont suppose just two half adder would do even if it were simple addition..what to do with Carry output? vtingole

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