using System;

public class Program

{

    // Lecture 42: Pass by reference and pass by value

    public static void Main()

    {

        // Pass by value

        // int, float, double, bools and all structs are passed by value, i.e. their value is copied to the called method

        int student1Grade = 75; 

        Console.WriteLine("Student's grade before extra credit is {0}", student1Grade);

        GiveExtraCredit(student1Grade);

        Console.WriteLine("Student's grade after extra credit is {0}", student1Grade);

        Console.WriteLine("------");

        //Pass by reference

        //Arrays are passed by reference. Same applies to classes. I.e. their value is used directly by the called method

        int[] grades = new int[1];

        grades[0] = 75;

        Console.WriteLine("Student's grade before extra credit is {0}", grades[0]);

        GiveExtraCreditArray(grades);

        Console.WriteLine("Student's grade after extra credit is {0}", grades[0]);      

    }

    public static void GiveExtraCredit(int studentGrade)

    {

        studentGrade += 3;

        Console.WriteLine("Student's grade after extra credit, inside function, is {0}", studentGrade);

    }

    public static void GiveExtraCreditArray(int[] grades)

    {

        grades[0] += 3;

    }

}