using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("5.0 + 4.0 = {0}",GetSum(5.0,4.5));

    }

    static void DoubleIt(int x, out int solution)

    {

        solution =  x * 2;

    }

    public static void Swap(ref int num1, ref int num2)

    {

        int temp = num1;

        num1 = num2;

        num2 = temp;

    }

    static double GetSum(double x = 1, double y = 1)

    {

        return x + y;

    }

    static double GetSum(string x = "1", string y = "1")

    {

        double dblX = Convert.ToDouble(x);

        double dblY = Convert.ToDouble(y);

        return dblX + dblY;

    }

    static double GetSumMore(params double[] nums)

    {

        double sum = 0;

        foreach(int i in nums)

        {

            sum +=i;

        }

        return sum;

    }

    static void PrintInfo(string name, int zipCode)

    {

        Console.WriteLine("{0} lives in the zip code {1}",name,zipCode);

    }

​

}