64. Full Adder

// Half Adder primitive
module half_adder (
    input  a, b,
    output sum, carry
);
    // Write code here
    xor(sum, a, b);
    and(carry, a, b);
    
endmodule

// Full Adder using 2 Half Adders
module full_adder_struct (
    input  a, b, cin,
    output sum, cout
);
    // Write code here
    wire[2:0] w;
    half_adder ha1(a, b, w[0], w[1]);
    half_adder ha2(w[0], cin, sum, w[2]);
    or(cout, w[1], w[2]);

endmodule