module adder17(X,Y,Cin,Cout,Sum); input[16:0] X,Y; input Cin; output[16:0] Sum; output Cout;  wire [15:0]A,B;  wire [15:0]ESum; wire wire1;  assign A=X[15:0]; assign B=Y[15:0];    //***Call a 16-bit CLA, and a one-bit full adder 17 constitute an adder*** adder16  EX(.A(A),.B(B),.Cin(Cin),.Cout(wire1),.Sum(ESum)); fulladder1 EU(.sum(Sum[16]),.cout(Cout),.cint(wire1),.A(X[16]),.B(Y[16]));  assign Sum[15:0]=ESum;  endmodule