263. Ugly Number

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2016/10/17 14:32
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263. 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.

public class Solution {
    public boolean isUgly(int num) {
        if(num<=0)
            return false;
        if(num==1)return true;
        while(num%2==0)num=num>>1;
        while(num%3==0)num=num/3;
        while (num%5==0)num=num/5;
        return num==1;
    }
}

 

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