66. Demultiplexer

Use an always block to set the particular bit as d

/*Write your code here*/
module demux1to4 (
    input d,
    input [1:0] s,
    output reg [3:0] y
);
    always @* begin
    y = 4'b0000;
    case(s)
    2'b00: y[0] = d;
    2'b01: y[1] = d;
    2'b10: y[2] = d;
    2'b11: y[3] = d;
    endcase
    end
endmodule