問(wèn)題

水仙花數(shù)定義：

1. 一定是 3 位數(shù)
2. 每一位的立方，加起來(lái)恰好是這個(gè)數(shù)本身，比如 153 = 1x1x1 + 5x5x5 + 3x3x3

尋找所有的水仙花數(shù)

解答

public class NarcissisticNumber
{
   public static void main (String[] args)
   {
       find();
   }
   
   public static void find ()
   {
       for (int high = 1; high <= 9; high++)
       {
           for (int middle = 0; middle <= 9; middle++)
           {
               for (int low = 0; low <= 9; low++)
               {
                   int t = thisNum(high, middle, low);
                   if ( t == sumOfnum3(high, middle, low) )
                   {
                       System.out.println( t );
                   }
               }
           }
       }
   }
   
   public static int thisNum (int high, int middle, int low)
   {
       return high*100 + middle*10 + low;
   }
   
   public static int sumOfnum3 (int high, int middle, int low)
   {
       return num3(high) + num3(middle) + num3(low);
   }
   
   public static int num3 (int num)
   {
       return num * num * num;
   }
}