leetcode---Ugly Number
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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.
class Solution {public: bool isUgly(int num) { if(num <= 0) return false; if(num == 1) return true; if(num % 2 == 0) while(num % 2 == 0) num /= 2; if(num % 3 == 0) while(num % 3 == 0) num /= 3; if(num % 5 == 0) while(num % 5 == 0) num /= 5; return num == 1; }};
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