using System;

​

class Calculation

{

    public int num1;

    public int num2;

    public Calculation(int x,int y)

    {

    num1 = x;

        num2 =y;

    }

    public void Addition()

    {

        Console.WriteLine(num1 + "+" + num2 + "=" + (num1 + num2));

    }

}

​

public class HelloWorld

{

    public static void Main()

    {

        //with constructor(less code needed)

        Calculation group_1 = new Calculation(10,15);

        group_1.Addition();

        /*without constructor

        Calculation group_2 = new Calculation2(30+20);

        group_2.num1=30;

        group_2.num2 =20;

        group_2.Addition();;*/

    }

}