using System;

​

/// <summary>

/// For use at https://dotnetfiddle.net/

/// </summary>

public class App

{

    /// <summary>

    /// Method to perform the complex calculations required for the application. Given

    /// an array of integers, this method calculates the sum, average, and number of

    /// elements divisible by seven.

    /// </summary>

    /// <param name="input">Input array of integers.</param>

    /// <param name="sum">Output of the method; contains the sum of all the integers.</param>

    /// <param name="average">Output of the method; contains the average of all of

    ///     the integers.</param>

    /// <param name="divisibleBySevenCount">Output of the method; contains the count

    ///     of integers that are divisible by seven.</param>

    private static void Calculate(int[] input, out int sum, out double average, out int divisibleBySevenCount)

    {

        throw new NotImplementedException();

    }

​

    /// <summary>

    /// Entry point for the application.

    /// </summary>

    public static void Main()

    {

        bool pass = true;

        try

        {

            RunTest(new int[] { 1, 2, 3 },

                6, 2, 0);

            RunTest(new int[] { 5, 6, 7 },

                18, 6, 1);

        }

        catch (Exception ex)

        {

            pass = false;

            Console.WriteLine(ex.ToString());

        }

        Console.WriteLine();

        Console.WriteLine(pass ? "Pass!" : "FAIL!");

    }

​

    /// <summary>

    /// Helper method to call the Calculate() method and compare the output to

    /// the expected output.

    /// </summary>

    private static void RunTest(int[] input, int expectedSum, double expectedAverage, int expectedDivisibleBySeven)

    {

        Console.Write("Calculate({3}): Sum={0} Average={1} Divisible-by-Seven={2}...",

            expectedSum, expectedAverage, expectedDivisibleBySeven,

            input != null ? String.Format("[{0}]", String.Join(", ", input)) : "<null>");

​

        try

        {

            int actualSum, actualDivisibleBySeven;

            double actualAverage;

            Calculate(input, out actualSum, out actualAverage, out actualDivisibleBySeven);

​

            if (actualSum != expectedSum)

            {

                throw new Exception(String.Format("Sum doesn't match! Expected={0} Actual={1}",

                    expectedSum, actualSum));

            }

            if (actualAverage != expectedAverage)

            {

                throw new Exception(String.Format("Average doesn't match! Expected={0} Actual={1}",

                    expectedAverage, actualAverage));

            }

            if (actualDivisibleBySeven != expectedDivisibleBySeven)

            {

                throw new Exception(String.Format("Divisible-by-seven count doesn't match! Expected={0} Actual={1}",

                    expectedDivisibleBySeven, actualDivisibleBySeven));

            }

​

            Console.WriteLine("pass!");

        }

        catch (Exception)

        {

            Console.WriteLine("fail!");

            throw;

        }

    }

}

​