Full Adder using module instantiation

//BlueTechspot.blogspot.com

module halfadder2 (a,b,s,c);

output s,c;

input a,b;

wire s,c;

xor (s,a,b);

and(c,a,b);

endmodule

module fulladder(A,B,Cin,Sum,Cout);

output Sum,Cout;

input A,B,Cin;

wire Sum,Cout,w1,w2,w3;

halfadder2 h1(.a(A),.b(B),.s(w1),.c(w2));

halfadder2 h2(.a(Cin),.b(w1),.s(Sum),.c(w3));

or (Cout,w2,w3);

endmodule