using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace passbyreference
{
    class PassByRef
    {
        static double Average(int a, int b)
        {
            double ave;

            Console.WriteLine("Beginning of method Average: a={0}, b={1}", a, b);
            a = a + b;
            ave = a / 2.0;
            Console.WriteLine("End of method Average: a={0}, b={1}", a, b);
            
            return ave;
        }

        static double AverageRef(ref int a, int b)
        {
            double ave;

            Console.WriteLine("Beginning of method Average: a={0}, b={1}", a, b);
            a = a + b;
            ave = a / 2.0;
            Console.WriteLine("End of method Average: a={0}, b={1}", a, b);

            return ave;
        }

        static void FunctionOutRef(ref int c, out int d)
        {
            d = c + 1;
            c = c + 1;
        }

        static void Main(string[] args)
        {
            int num1, num2;

            Console.WriteLine("Enter two integers: ");
            num1 = Convert.ToInt32(Console.ReadLine());
            num2 = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("In Main before calling average: num1={0}, num2={1}", num1, num2);
            double average = Average(num1, num2);
            // double average = AverageRef(ref num1, num2);
            Console.WriteLine("In Main average={0}", average);
            Console.WriteLine("In Main after calling average: num1={0}, num2={1}", num1, num2);

            int num3 = 5, num4;
            FunctionOutRef(ref num3, out num4);
        }
    }
}