ICSE Specimen Paper 2020 - Question 6.

/**
 * Question 6 of the ICSE Specimen Paper 2020.
 * Specimen Paper: http://www.cisce.org/pdf/ICSE-Class-X-Specimen-Question-Papers-2020/Computer%20Applications_Specimen_2020.pdf
 */
public class Question_6
{
    int Sum(int A, int B)
    {
        int i;
        int sum = 0;
        for(i=A;i<=B;i++)
        {
            if(i%2 == 0)
                sum += i;
        }

        return sum;
    }

    double Sum(double N)
    {
        double i = 1.0;
        double prod = 1;
        while(i<=N)
        {
            prod *= i;
            i += 0.2;
        }

        return prod;
    }

    int Sum(int N)
    {
        String num = Integer.toString(N);
        int sum = 0;
        int i, digit;
        char x;
        for(i=0;i<num.length();i++)
        {
            x = num.charAt(i);
            digit = Character.getNumericValue(x);
            if(digit % 2 != 0)
            {
                sum += digit;
            }
        }

        return sum;
    }

    public static void main(String[] args)
    {
        Question_6 s1 = new Question_6(); //Creating an object to invoke the functions.

        int a = s1.Sum(4, 16); //Expected Output - 4 + 6 + 8 + 10 + 12 + 14 + 16 = 70.
        System.out.println(a);

        double b = s1.Sum(2.0); //Expected Output - 1.0 x 1.2 x 1.4 x 1.6 x 1.8 x 2.0 = 9.6768.
        System.out.println(b);

        int c = s1.Sum(43961); //Expected Output - 3 + 9 + 1 = 13.
        System.out.println(c);
    }
}