If we are to build a computer out of Logg-O-like circuits, we had better be able to do some computing with them - and we can! The circuits described below take an (admittedly small) step towards illustrating how logical¹ gates² can be combined to simulate arithmetic.

1. Use Logg-O to build one-bit half adder³ using AND, OR, and NOT gates, as described in figure 7.7 of your text. Test it using all possible combinations of inputs.
   
   
2. Use Logg-O's "Save as..." button to save your circuit in a file named "halfadd.dat"
   
   
3. Add to your half adder circuit the gates and connections necessary to implement a one-bit full adder, as depicted in figure 7.8 in your text. After testing your full adder, save it as "fulladd.dat".