module full_adder(

input a, b, cin,

output cout, sum );

assign sum = a^b^cin;

assign cout = (a&b) | (a&cin) | (b&cin);

endmodule

module top_module(

input [2:0] a, b,

input cin,

output [2:0] cout,

output [2:0] sum );

full_adder fa[2:0](a, b, {cout[1:0] ,cin}, cout, sum);

endmodule