JAVA每周一题(3)-----水仙花数

import java.util.Scanner;

public class shuixianhua
{
    public static void main(String[] args)
    {
    int x=100,i,a,b,c;
    for(;x<=999;x++)
        {
        a=x%10;b=((x-a)%100)/10;c=(x-b*10-a)/100;/*a为个位，b为十位，c为百位*/      
        if(x==(Math.pow(a,3)+Math.pow(b,3)+Math.pow(c,3)))
        System.out.print(x+"\t");
        }
   
    }
}

//水仙花数
class Daffodils {
    public static boolean isDaffodils(int a) {  //判断是否水仙花数
        int hundred = a / 100 % 10;
        int ten = a / 10  % 10;
        int unit = a % 10;
        return (a == hundred*hundred*hundred + ten*ten*ten + unit*unit*unit) ? true : false;
    }
  public static void printDaffodils(int a, int b) {   //输出从a到b的水仙花数
      for (int i = a; i <= b; i++) {
          if (Daffodils.isDaffodils(i))   
            System.out.println(i);
        }
    }
}

public class MyClass {
    public static void main(String[] args) {
        int from = 100, to = 999;      //从 100 到 999
        System.out.println("以下是您要的水仙花数 从" + from + "到" + to);
        Daffodils.printDaffodils(from, to);
    }
}
//欢迎拍砖，谢谢

import java.util.Scanner;

public class NarcissisticNumber
{
    static int place(int s)
    {
        int i=0;
        for(;s!=0;i++)
        {
            s/=10;
        }
        return i;
    }
    static void action(int s,int e)
    {
        int c=0,n;
        for(int i=s;i<=e;i++)
        {
            int sum=0,t=i;
            n=NarcissisticNumber.place(t);
            for(;t!=0;)
            {
                sum+=Math.pow(t%10,n);
                t/=10;
            }
            if(i==sum)
            {
                c++;
                System.out.println(i+"是水仙花数。");
            }
        }
        if(0==c)
        {
            System.out.println(s+"到"+e+"区间内没有水仙花数。");
        }
    }
    static boolean judge(int s)
    {
        int sum=0,n;
        n=NarcissisticNumber.place(s);
        for(int i=0,t=s;t!=0;i++)
        {
            sum+=Math.pow(t%10, n);
            t/=10;
        }
        if(s==sum)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    /**
     * @param args
     */
    public static void main(String[] args)
    {
        Scanner in=new Scanner(System.in);
        
        System.out.println("请输入你要判断水仙花数的起始数字");
        int s=in.nextInt();
        System.out.println("请输入你要判断水仙花数的末数字，若只判断一个数是否为水仙花数，请输入1");
        int e=in.nextInt();
        if(e==1|s==e)
        {
            if(NarcissisticNumber.judge(s))
            {
                System.out.println(s+"是水仙花数。");
            }
            else
            {
                System.out.println(s+"不是水仙花数。");
            }
        }
        else
        {
            NarcissisticNumber.action(s,e);
        }
    }
}