[Leetcode] Ugly Number
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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) { while(num % 2 == 0 && num != 0){ num /= 2; } while(num % 3 == 0 && num != 0){ num /= 3; } while(num % 5 == 0 && num != 0){ num /= 5; } return num==1; }}
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