class StringFormat {
  public static void main(String[] args) {
      int a=3, b=4;
      System.out.printf("%d + %d = %d\n", a, b, a+b);
      
      System.out.printf("%10.2f\n", 3.0/7);
      System.out.printf("%08d\n", 124);

      String s = String.format("%d + %d = %d", a, b, a+b);
      System.out.println(s);

      for(int i=0; i<=10; i++) {
      	  System.out.printf( "%2d  %6.0f\n", i, Math.pow(2, i) );
      }

  }
}