leetcode-263-Ugly Number

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.

class Solution {
public:
bool isUgly(int num) {
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;
}
return num == 1;
}
};