using System;

using System.Collections.Generic;

using System.Linq;

​

using static System.Console;

​

//C# 7 is coming soon in VS 2017

//Try out some of the new features without having to install VS 2017 RC

​

public class Program

{

    public static void Main()

    {

        NestedFunctions();

        EnhancedTuples();

    }

​

    public static void NestedFunctions()

    {

        WriteFeatureHeader("Nested functions", "Small helper functions available only in the scope of parent function");

        void Add(int x, int y)

        {

            WriteLine($"Sum of {x} and {y} is : {x + y}");

        }

​

        void Multiply(int x, int y)

        {

            WriteLine($"Multiply of {x} and {y} is : {x * y}");

            Add(30, 10);

        }

​

        Add(20, 50);

        Multiply(20, 50);

    }

    public static void EnhancedTuples()

    {

        WriteFeatureHeader("Enhanced Tuples", "Declare tuples inline");

        var numbers = new List<int> {5, 10, 45, 23};

        var aggregate = Aggregate(numbers);

        //Console.WriteLine($"Count: {aggregate.count}, Sum: {aggregate.sum}, Avg: {aggregate.avg}");

    }

    static (int count, int sum, double avg) Aggregate(IEnumerable<int> numbers)

    {

        int count = numbers.Count();

        int sum = numbers.Sum();

        double avg = sum/count;

        return (count, sum, avg);

    }

​

    public static void WriteFeatureHeader(string name, string description)

    {

        Console.WriteLine();

        Console.WriteLine("==============================");

        Console.WriteLine($"{name}".ToUpper());

        Console.WriteLine($"{description}");

        Console.WriteLine("==============================");

        Console.WriteLine();

    }

}