LeetCode 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.

只能被2、3、5整除的数，不断除2、3、5后，余数为1，余数为其它时，则不是-Ugly Number

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