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:
1is typically treated as an ugly number.- Input is within the 32-bit signed integer range.
class Solution {
public:
bool isUgly(int num) {
if(num == 0){
return false;
}else if(num == 1){
return true;
}else{
while(num % 2 == 0){
num /= 2;
}
while(num % 3 == 0){
num /= 3;
}
while(num % 5 == 0){
num /= 5;
}
if(num == 1){
return true;
}else{
return false;
}
}
}
};class Solution {
public boolean isUgly(int num) {
if(num == 0){
return false;
}else if(num == 1){
return true;
}else{
while(num % 2 == 0){
num /= 2;
}
while(num % 3 == 0){
num /= 3;
}
while(num % 5 == 0){
num /= 5;
}
if(num == 1){
return true;
}else{
return false;
}
}
}
}