64. Full Adder

How do you plan to solve it?

// Half Adder primitive
module half_adder (
    input  a, b,
    output sum, carry
);

assign sum = a ^ b;
assign carry = a & b;

endmodule

// Full Adder using 2 Half Adders
module full_adder_struct (
    input  a, b, cin,
    output sum, cout
);

wire s1, c1, c2;

half_adder ha1 (a, b, s1, c1);
half_adder ha2 (s1, cin, sum, c2);
assign cout = c1 | c2;

endmodule