Now that you know how to build a full adder, make 3 instances of it to create a 3-bit binary ripple-carry adder. The adder adds two 3-bit numbers and a carry-in to produce a 3-bit sum and carry out. To encourage you to actually instantiate full adders, also output the carry-out from each full adder in the ripple-carry adder. cout is the final carry-out from the last full adder, and is the carry-out you usually see.
module top_module( input [2:0] a, b, input cin, output [2:0] cout, output [2:0] sum );
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