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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.
思路：
1).＝＝优先级高于&，因此要记得加括号。
1 class Solution { 2 public: 3 bool isUgly(int num) { 4 if(num==0){ 5 return false; 6 } 7 while((num&1)==0){ 8 num>>=1; 9 } 10 while(num%3==0){ 11 num/=3; 12 } 13 while(num%5==0){ 14 num/=5; 15 } 16 if(num==1){ 17 return true; 18 }else{ 19 return false; 20 } 21 } 22 };
leetcode:263 Ugly Number－每日编程第十七题
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原文地址：http://www.cnblogs.com/yishuimao/p/5035379.html
