Num tester

@foxushun

10 years ago

https://everycircuit.com/circuit/5055197811834880

0 = 0 A = 1 B = 2 A + B = 3 C = 4 C + A = 5 C + B = 6 C + B + A = 7 D = 8 D + A = 9 D + B = A D + A + B = B D + C = C A + C + D = D B + C + D = E A + B + C + D = F