using System;

public class Program

{

    public static void Main()

    {

        // call by value:

        // in c# value-type parameters are that pass a copy of original valuue to the function. it does not modify the original value.

        // address

        int x = 2;

        Program pro = new Program();

        Console.WriteLine("value before calling the function "+x); // x = 2

        pro.show(x); // calling function by passing value x = 4

        Console.WriteLine("value after calling the function: "+x); // x = 2

    }

    public void show(int x){

      x = x * x;

        Console.WriteLine("value inside this function is: "+x);

    }

}