FULL ADDER

module fa(s,cout,a,b,cin);

//sub module for Full adder

input a,b,cin;

output s,cout;

wire w1,w2,w3;

ha m1(w1,w2,a,b);

ha m2(s,w3,w1,cin);

or m3(cout,w2,w3);

endmodule

module ha(s,cout,a,b);

 //sub module for Half adder

  input a,b;

  output s,cout;

  xor m1(s,a,b);

  and m2(cout,a,b);

endmodule