LeetCode – Ugly Number (Java)

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.

Java Solution

public boolean isUgly(int num) {
    if(num==0) return false;
    if(num==1) return true;
 
    if(num%2==0){
        num=num/2;
        return isUgly(num);
    }
 
    if(num%3==0){
        num=num/3;
        return isUgly(num);
    }
 
    if(num%5==0){
        num=num/5;
        return isUgly(num);
    }
 
    return false;
}
Category >> Algorithms  
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