using System;

public class Program

{

    public static void Main()

    {

        int i, j;

        i=1;

        j=1;

        Console.WriteLine("Before calling the function: ");

        Console.WriteLine("i= "+i+".j="+j);

        changeNumsDemo(i, ref j);

        Console.WriteLine("AFTER calling the function: ");

        Console.WriteLine("i= "+i+".j="+j);

        // meaning that the value passed by reference can be changed inside the functions called

        // while the value passed by copy can not.

    }

    static void changeNumsDemo(int a, ref int b)//think ref as a memory location which changes the original info 

    {

        a = 10*a;

        b = 10*b;

    }

    // when using the ref, changing the data will change the data in the original function 

    // when not using ref, it is defaluted as value

}