EvenDigits.java

public class EvenDigits {
    public static void main(String[] args) {
        int[] nums = {12, 345, 2, 6, 7896};
        System.out.println(findNumber(nums));
        System.out.println(digits(0));
        System.out.println(digits2(6544));

    }
    static int findNumber(int[]nums){
        int count = 0;
        for(int num: nums){
            if(even(num)){
                count++;
            }
        }
        return count;
    }

    static int digits2(int num){
        if (num < 0 ){
            num=num *-1;
        }
        if(num == 0){
            return 1;
        }
        return (int)(Math.log10(num)) + 1;
    }
    static boolean even(int num){
        int numberOfDigits = digits(num);
        if (numberOfDigits %2 == 0){
            return true;
        }
        return false;
    }

    //count number of digits in a number
    static int digits(int num){
        if (num < 0 ){
            num=num *-1;
        }
        if(num == 0){
            return 1;
        }
        int count = 0;

        while(num>0){
            count++;
            num = num / 10; // num /= 10
        }
        return count;
    }
}