263. Ugly Number

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Total Submissions: 116368
Difficulty: Easy

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.

注意0不是就好

Java:

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public class Solution {
    public boolean isUgly(int num) {
        if(num==0) return false;
        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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