Question

Task 6: Create a function in Java that counts the number of even digits in a positive integer.
public static int countEvenDigits(int a); // Ex, countEvenDigits(1234) => 2

Task 7: Create a generic function that returns digits in a given range. The ones place corresponds to power 0, the tens place corresponds to power 1, the hundreds place corresponds to power 2, and so on. Think 10^3 => 1000 => thousands place. (Do not use exponents in your code.)
// Ex, getDigits(12345,0,0) => 5

Answer 1

public class CountEvenDigits {

    public static int countEvenDigits(int a) {
        int count = 0;
        if (a == 0) {
            count = 1;
        } else {
            while (a > 0) {
                if ((a % 10) % 2 == 0) {
                    count++;
                }
                a /= 10;
            }
        }
        return count;
    }

    public static void main(String[] args) {
        System.out.println(countEvenDigits(1234));
    }
}