[HDLBits] Count15

Build a 4-bit binary counter that counts from 0 through 15, inclusive, with a period of 16. The reset input is synchronous, and should reset the counter to 0.

module top_module (
    input clk,
    input reset,      // Synchronous active-high reset
    output [3:0] q);
    always@(posedge clk) begin
        if(reset)
            q<=4'b0;
        else if(q<15)
            q<=q+1;
        else
            q<=4'b0;
    end
endmodule