evenDigits.java

public class evenDigits{
    public static void main(String[] args) {
        int[] nums = {12,345,2,6,7896};
       System.out.println(findNumbers(nums));

       // System.out.println(digits2(-345678));
    }
    static int findNumbers(int[] nums) {
        int count = 0;
        for(int num:nums) {
            if (even(num)) {
                count++;
            }
        }
        return count;
    }

    // function to check whether a number contains even digits or not
    static boolean even(int num) {
        int numberOfDigits = digits(num);
        /*
        if (numberOfDigits % 2 == 0) {
            return true;
        }
        return false;
         */
        return numberOfDigits % 2 == 0;
    }

    // static int digits2(int num) {
    //     if (num < 0) {
    //         num = num * -1;
    //     }
    //     return (int)(Math.log10(num)) + 1;
    // }

    // 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;
    }


}