AdventOfCodeDay4-2019

public class Day4Problem1
{
    public static void main(){

    int count = 0;
    for(int i = 178416; i <= 676561; i++){

        if(checkNum(i))
            count++;

    }

    System.out.println(count);
    }


    public static boolean checkNum(int n){
        boolean hasDouble = false;
        int current;
        int next;
        while(n > 0){
            current = n%10;
            n /= 10;
            next = n%10;

            if(next > current)
                return false;
            else if(current == next)
                hasDouble = true;

        }
        return hasDouble;
    }
}