module full_adder(
    x, y, c_in,
    s, c_out
);
    input x, y;
    input c_in;
    output s;
    output c_out;

    assign #5 s = x ^ y ^ c_in;
    assign #5 c_out = ( x & y ) | ( y & c_in) | ( x & c_in );
endmodule