Ugly Number
Write a program to check whether a given number is an ugly number.
Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7.
Note that 1 is typically treated as an ugly number.
1 /* 2ms */ 2 3 public class Solution { 4 5 int quyu(int a,int q){ 6 while(a%q==0){ 7 a=a/q; 8 }return a; 9 } 10 public boolean isUgly(int num) { 11 12 if(num==0){ 13 return false; 14 } 15 num=quyu(num,2); 16 num=quyu(num,3); 17 num=quyu(num,5); 18 19 if(num==1){ 20 return true; 21 }else{ 22 return false; 23 } 24 } 25 }
1 /* 5ms */ 2 3 public class Solution { 4 5 public boolean isUgly(int num) { 6 7 if(num==0) return false; 8 while(num%2==0) num/=2; 9 while(num%3==0) num/=3; 10 while(num%5==0) num/=5; 11 12 if(num==1) return true; 13 else return false; 14 } 15 }
原文：http://www.cnblogs.com/Juntaran/p/5428852.html