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.
代码如下:
public class Solution { public boolean isUgly(int num) { if(num<=0) return false; if(num==1) return true; while(num%2==0) num/=2; while(num%3==0) num/=3; while(num%5==0) num/=5; return num==1; } }
运行结果:
时间: 2024-10-14 04:42:45