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; boolean flag = true; while(flag) { flag = false; if(num%2==0) { num = num/2; flag = true; } else if(num%3==0) { num = num/3; flag = true; } else if(num%5==0) { num = num/5; flag = true; } } if(num==1) return true; else return false; } }