Oppgave 1

  System.out.printf("%a%n", x);

Oppgave 2

  System.out.printf("%s  %s%n", 0.001, 0.0001);          // 0.001  1.0E-4
  System.out.printf("%s  %s%n", 1000000.0, 10000000.0);  // 1000000.0  1.0E7