using System;

​

public struct MyStruct

{

    public int myValue;

    public MyStruct(int v)

    {

        this.myValue = v;

    }

    public override string ToString() => myValue.ToString();

}

​

public class MyClass

{

    public int myValue;

    public MyClass(int v)

    {

        this.myValue = v;

    }

    public override string ToString() => myValue.ToString();

}

public class Program

{

    public static void Main()

    {

        var myStructArr = new MyStruct[5];

        var myClassArr = new MyClass[5];

        for (int i = 0; i < 5; i++)

            myStructArr[i] = new MyStruct(i);

        for (int i = 0; i < 5; i++)

            myClassArr[i] = new MyClass(i);

        Console.WriteLine("Printing MyStruct values original");

        for (int i = 0; i < 5; i++)

            Console.Write($"{myStructArr[i]} ");

        Console.WriteLine();

        Console.WriteLine("Printing MyClass values original");

        for (int i = 0; i < 5; i++)

            Console.Write($"{myClassArr[i]} ");

        Console.WriteLine();

        Console.WriteLine();

        Console.WriteLine("Modifying values directly from array");

        for (int i = 0; i < 5; i++)

            myStructArr[i].myValue = 10 + i;

        for (int i = 0; i < 5; i++)

            myClassArr[i].myValue = 10 + i;

        Console.WriteLine("Printing MyStruct values after 1st modification");

        for (int i = 0; i < 5; i++)

            Console.Write($"{myStructArr[i]} ");

        Console.WriteLine();

        Console.WriteLine("Printing MyClass values after 1st modification");

        for (int i = 0; i < 5; i++)

            Console.Write($"{myClassArr[i]} ");

        Console.WriteLine();

        Console.WriteLine();

        Console.WriteLine("Modifying values using a local variable");

        for (int i = 0; i < 5; i++)

        {

            var myStruct = myStructArr[i];

            myStruct.myValue = 20 + i;

        }

        for (int i = 0; i < 5; i++)

        {

            var myClass = myClassArr[i];

            myClass.myValue = 20 + i;

        }

        Console.WriteLine("Printing MyStruct values after 2nd modification");

        for (int i = 0; i < 5; i++)

            Console.Write($"{myStructArr[i]} ");

        Console.WriteLine();

        Console.WriteLine("Printing MyClass values after 2nd modification");

        for (int i = 0; i < 5; i++)

            Console.Write($"{myClassArr[i]} ");

        Console.WriteLine();

        Console.WriteLine();

        Console.WriteLine("Modifying values using a ref local variable");

        for (int i = 0; i < 5; i++)

        {

            ref var myStruct = ref myStructArr[i];

            myStruct.myValue = 30 + i;

        }

        for (int i = 0; i < 5; i++)

        {

            ref var myClass = ref myClassArr[i];

            myClass.myValue = 30 + i;

        }

        Console.WriteLine("Printing MyStruct values after 3rd modification");

        for (int i = 0; i < 5; i++)

            Console.Write($"{myStructArr[i]} ");

        Console.WriteLine();

        Console.WriteLine("Printing MyClass values after 3rd modification");

        for (int i = 0; i < 5; i++)

            Console.Write($"{myClassArr[i]} ");

        Console.WriteLine();

    }

}