Verilog Code for 4x16 Decoder

Sr. No.	Name of the Pin	Direction	Width	Description
1	D_in	Input	4	Input to be decoded
2	D_out	Output	16	Decoded output

module decoder_4x16 (d_out, d_in);

   output [15:0] d_out;
   input [3:0]   d_in;
   parameter tmp = 16'b0000_0000_0000_0001;

assign d_out = (d_in == 4'b0000) ? tmp   :
               (d_in == 4'b0001) ? tmp<<1:
               (d_in == 4'b0010) ? tmp<<2:
               (d_in == 4'b0011) ? tmp<<3:
               (d_in == 4'b0100) ? tmp<<4:
               (d_in == 4'b0101) ? tmp<<5:
               (d_in == 4'b0110) ? tmp<<6:
               (d_in == 4'b0111) ? tmp<<7:
               (d_in == 4'b1000) ? tmp<<8:
               (d_in == 4'b1001) ? tmp<<9:
               (d_in == 4'b1010) ? tmp<<10:
               (d_in == 4'b1011) ? tmp<<11:
               (d_in == 4'b1100) ? tmp<<12:
               (d_in == 4'b1101) ? tmp<<13:
               (d_in == 4'b1110) ? tmp<<14:
               (d_in == 4'b1111) ? tmp<<15: 16'bxxxx_xxxx_xxxx_xxxx;

endmodule