We are currently working with full adders in my logic circuits class. I have the following code for a 4-bi full adder, however I'm having trouble understanding it and my textbook does a poor job at explaining the carry adders. fulladder f1(SW,SW,a,LEDG,b); this is the only line that I don't understand. I've seen this kind of code several times but no-one explains it. Can someone give a hand?