M1// gai ming! public static int palindroCount( int n) { int result = 0; if (! i

Question

 M1// gai ming!  public static int palindroCount(int n) {     int result = 0;     if (!isPalindrome(n))     {         result = 1;         while (!isPalindrome(n +invert(n)))         {             result++;             n += invert(n);             if (result > 10) result = -1;         }     }     return result; }  private static int invert(int n) {     String invert = "";     String number = String.valueOf(n);     for (int i = 0; i < number.length(); i++)     {         invert += number.charAt(number.length() - 1 - i);     }     return Integer.parseInt(invert); }  private static boolean isPalindrome(int n) {     boolean result = true;     String number = String.valueOf(n);     for (int i = 0; i < number.length(); i++)     {         if (number.charAt(i) != number.charAt(number.length() - 1 - i)) result = false;     }     return result; }  public static void main(String[] args) {     System.out.println(isPalindrome(11));     System.out.println(isPalindrome(1431));     System.out.println(isPalindrome(131));     System.out.println(invert(7654));     System.out.println(palindroCount(159)); } 

Explanation / Answer

Code

public class CheckPalindrome {

   public static int palindroCount(int n)
   {
   int result = 0;
   if (!isPalindrome(n))
   {
   result = 1;
   while (!isPalindrome(n +invert(n)))
   {
   result++;
   n += invert(n);
   if (result > 10) result = -1;
   }
   }
   return result;
   }

   private static int invert(int n)
   {
   String invert = "";
   String number = String.valueOf(n);
   for (int i = 0; i < number.length(); i++)
   {
   invert += number.charAt(number.length() - 1 - i);
   }
   return Integer.parseInt(invert);
   }

   private static boolean isPalindrome(int n)
   {
   boolean result = true;
   String number = String.valueOf(n);
   for (int i = 0; i < number.length(); i++)
   {
   if (number.charAt(i) != number.charAt(number.length() - 1 - i)) result = false;
   }
   return result;
   }

   public static void main(String[] args) {
   System.out.println(isPalindrome(11));
   System.out.println(isPalindrome(1431));
   System.out.println(isPalindrome(131));
   System.out.println(invert(7654));
   System.out.println(palindroCount(159));
   }
}

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