简单题
Total Accepted: 32635 Total Submissions: 94009 Difficulty: Easy
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.
Discuss中总有惊喜：
Java：
for (int i=2; i<6 && num>0; i++)
while (num % i == 0)
num /= i;
return num == 1;
Python：
for p in 2, 3, 5:
while num % p == 0 < num:
num /= p
return num == 1
C++：（其中&&之后的num怎么理解？）
for (int i=; i< && num; i++)
while (num % i == )
num /= i;
return num == ;
自己的：
C++：
class Solution {
public:
bool isUgly(int num) {
if (num <= )
return false;
if (num == )
return true;
while (num != ) {
if (num % == ) {
num = num / ;
}
else if (num % == ) {
num = num / ;
}
else if (num % == ) {
num = num / ;
}
else{
return false;
}
}
return true;
}
};