算法之水仙花数（Java语言）

 1 /**
 2  * A Narcissistic number is a number that is the sum of its own digits each
 3  * raised to the power of the number of digits. E.g., 0, 1, 2, 3, 4, 5, 6, 7, 8,
 4  * 9, 153, 370, 371, 407, 1634, 8208, 9474.
 5  */
 6 public class NarcissisticNumberExample {
 7     //判断value是否为水仙花数
 8     public static boolean isNarcissisticNumber(int value) {
 9         int temp = value;
10         int digits = 0;
11         //判断value有几位数，保存在digits
12         while (temp > 0) {
13             digits++;
14             temp /= 10;
15         }
16         temp = value;
17         int sum = 0;
18         while (temp > 0) {
19             sum += Math.pow(temp % 10, digits);
20             temp /= 10;
21         }
22         return sum == value;
23     }
24     
25     //开始数和结束数
26     public static void printNarcissistics(int from, int to) {
27         int which=0;
28         for (int i = from; i <= to; i++)
29             if (isNarcissisticNumber(i)){
30                 which++;
31                 System.out.println("第"+which+"个水仙数是："+i);
32             }
33 
34                 
35     }
36     
37     //1000里有几个水仙数
38     public static void main(String[] args) {
39         printNarcissistics(0,1000);
40     }
41 
42 }