Guess D Amstrong Number !!

An Armstrong number is a number, sum of cubes of whose digits is equal to the number itself i.e. If the number is ab then (a^3)+(b^3)=ab By the options it's pretty obvious that the correct option is 153 and you don't need to know Computer Science for the question. Because 1^3 + 5^3 + 3^3 =153

Here is my code in C#..

    Here is the subroutine....

    private bool GetNo_(int a)
    {
        int b, c, d, e;
        double f;

        b = 0;
        c = 0;
        d = 0;
        e = 0;
        f = 0;

        b = a % 10;
        c = a / 10;
        d = c % 10;
        e = c / 10;

        f = Math.Pow(b, 3) + Math.Pow(d, 3) + Math.Pow(e, 3);

        if (a == f)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

        Here is the calling routine..

        ArrayList ar = new ArrayList();

        ar.Add(100);
        ar.Add(156);
        ar.Add(89);
        ar.Add(153);

        bool IsArmstrongNo = false;

        for (int r = 0; r < ar.Count; r++)
        {
            IsArmstrongNo = GetNo_(int.Parse(ar[r].ToString()));

            if (IsArmstrongNo == true)
            {
                MessageBox.Show(ar[r].ToString() + " is an Armstrong number.");
                break;
            }
        }

       Answer : 153

Just try that code