always @(*)
begin
case(digits)
 // 2X = 8'b00100101;
 //3X = 8'b00001101;
 //4X = 8'b10011001;
//1X = 8'b10011111;

    4'b1111 :begin heks=8'b00000011;

                        end
    //4'b1111 : HEX1 = 8'b00000011;
    4'b1110 : begin heks = 8'b10011111;

                        end
    4'b1101 : begin heks = 8'b00100101;

                        end
    4'b1100 : begin heks = 8'b00001101;

                        end
    4'b1011 : begin heks = 8'b10011001;

                        end
    4'b1010 : begin heks = 8'b01001001;

                        end
    4'b1001 :begin heks = 8'b01000001;

                        end
    4'b1000 :begin  heks = 8'b00011111;

                        end
    4'b0111 : begin heks = 8'b01001001;

                        end
    4'b0110 : begin heks = 8'b00001001;

                        end
    4'b0101 : begin
                       heks = 8'b00000011;
                end

    4'b0100 : begin
                        heks = 8'b10011111;
                        end
    4'b0011 : begin
                        heks = 8'b00100101;
                        end
    4'b0010 : begin
                        heks = 8'b00001101;
                        end
    4'b0001 : begin
                        heks = 8'b10011001;
                        end
    4'b0000 : begin
                        heks = 8'b01001001;
                        end
    //4'b0101 : heks = 8'b00000011;
 // 5X = 8'b01001001;

 //7X = 8'b00011111;

 //6 X = 8'b01000001;

 //8 X = 8'b00000001;

     //9 X = 8'b00001001;
     endcase


end

endmodule

module Cw1 (HEX0, HEX1, HEX2, HEX3);
output [0:7] HEX0;
output [0:7] HEX1;
output [0:7] HEX2;
output [0:7] HEX3;

zad1(.digits(4'b1011), .heks(HEX3));
zad1(.digits(4'b1101), .heks(HEX2));
zad1(.digits(4'b0000), .heks(HEX1));
zad1(.digits(4'b1101), .heks(HEX0));

endmodule