Ok so I have to design a two bit adder with a carry out. The input must be controlled with dipswitches and the outputs must be indicated by led's. I have tried to deign this. I have 5 switches. 4 for the inputs lets say A0 A1 B0 B1 and one switch for the c-in. I then added my adders. I connected the first adder c-out to the second adder c-in. The 2 sums are attached to there own individual led's and so is the c-out of the second adder. All connected to ground. When I try to simulate it works fine for A0 and B0 but for the others I get an error. Any idea on what I'm doing wrong.
