module Yut (input iw[0:7], input iw2[0:7],input zad[0:3],output ow[0:7])
case(zad)
'0001': assign ow = iw + iw2;
'0010': assign ow = iw - iw2;
'0100': assign ow = iw * iw2;
'1000': assign ow = iw / iw2;
endcase
endmodule