java入门练习题三

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1.水仙花数：每个位的数的立方和等于这个数

package com.pratice.daily;public class ShuiXianHuaNum {public void findShuXianHuaNum(){for(int i=100;i<1000;i++){int a = i%100%10;int b = i/10%10;int c = i/100;int d = (int) (Math.pow(a, 3)+Math.pow(b, 3)+Math.pow(c, 3));if (d==i)System.out.println(i);}}public static void main(String[] args) {// TODO Auto-generated method stubShuiXianHuaNum sxhn = new ShuiXianHuaNum();sxhn.findShuXianHuaNum();}}

2.分解质因数

package com.pratice.daily;public class DecomposeNUM {public void decompose(int Num){if(Num <=2){System.out.println("Number must be larger than 2");return;}int[] nums = null;nums = new int[8];int j=0;int i=2;while(true){for(i=2;i<Num;i++){if(i>=Num) break;else if(Num%i==0){nums[j] =i;j++;Num = Num/i;break;}else continue;}if(i>=Num){if(j==0) return;else {nums[j]=Num;for(int a=0;a<j;a++)System.out.print(nums[a]+"*");System.out.print(nums[j]+"");return;}}}}public static void main(String[] args) {// TODO Auto-generated method stubDecomposeNUM dnum = new DecomposeNUM();dnum.decompose(100);}}

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