class ErroresArreglos {

  public static void main(String [] args) {

       int [] unArreglo
       int tamagno= 30;
       for (i=0;i<=tamagno;i++) {
           unArreglo[i]=i*2;
       }

       for (j=tamagno.length;i>0;i--) 
            System.out.printnl(unArreglo(i));
  }

}