Sample input:
112233
30800
2937
323455693
5038297
112234
0

Sample output
112233 is a multiple of 11.
30800 is a multiple of 11.
2937 is a multiple of 11.
323455693 is a multiple of 11.
5038297 is a multiple of 11.
112234 is not a multiple of 11.



大意:
給1個1000位以下的數字 求可否被11整除



import java.util.Scanner;

public class UVA10929 {

 public static void main(String[] args) {

  Scanner sc = new Scanner(System.in);

  while (true) {

   String N = sc.next();

   if (N.equals("0"))
    break;

   long sum = 0;

   for (int i = 1; i <= N.length(); i++) {

    if (i % 2 != 0) {
     sum += Integer.parseInt(N.substring(i - 1, i));

    } else if (i % 2 == 0) {

     sum -= Integer.parseInt(N.substring(i - 1, i));
    }

   }

   if (sum % 11 == 0)
    System.out.println(N + " is a multiple of 11.");

   else
    System.out.println(N + " is not a multiple of 11.");

  }

 }

}