input [3:0] hex;
output [6:0] seg;
reg [6:0] seg;
always@( hex )
begin
case ( hex)
4'b0001 : seg = 7'b111_1001;
4'b0010 : seg = 7'b010_0100;
4'b0011 : seg = 7'b011_0000;
4'b0100 : seg = 7'b001_1001;
4'b0101 : seg = 7'b001_0010;
4'b0110 : seg = 7'b000_0010;
4'b0111 : seg = 7'b111_1000;
4'b1000 : seg = 7'b000_0000;
4'b1001 : seg = 7'b001_0000;
4'b1010 : seg = 7'b000_1000;
4'b1011 : seg = 7'b000_0011;
4'b1100 : seg = 7'b100_0110;
4'b1101 : seg = 7'b010_0001;
4'b1110 : seg = 7'b000_0110;
4'b1111 : seg = 7'b000_1110;
default : seg = 7'b100_0000;