0;
      end
    else
      begin
        data_out <= data_in;
      end

  end
  
endmodule

// Class definition
class test;

  /**
   * Sum two integers
   */
  function int sum(int a, int b);
    int result = a + b;
    string msg = $sformatf("%d + %d = %d", a, b, result);
    $display(msg);
    return result;
  endfunction
  
  task delay(int num_cycles);
    repeat(num_cycles) #1;
  endtask
  
endclass

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