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.

Credits:

Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.

Difficulty: Easy

Python:

class Solution(object):
def isUgly(self, num):
"""
:type num: int
:rtype: bool
"""
if num==0:
return False
while num%2==0:
num = num/2
while num%3==0:
num = num/3
while num%5==0:
num = num/5
if num ==1:
return True
return False

c++:

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