Write a program in C# for partial class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication6
{
    partial class calc
    {
        public void Add(int x, int y)
        {
            Console.WriteLine(x+y);
        }
    }
    partial class calc
    {
        public void sub(int x, int y)
        {
            Console.WriteLine(x-y);
        }
    }
    partial class calc
    {
        public void mul(int x, int y)
        {

            Console.WriteLine(x*y);
        }
    }
    partial class calc
    {
        public void div(int x, int y)
        {
            Console.WriteLine(x/y);
        }
    }

class Program   
 {
        static void Main(string[] args)
        {
            calc ob = new calc();
            ob.Add(10, 20);
            ob.sub(20, 16);
            ob.mul(2, 8);
            ob.div(25, 5);
        }
    }
}



OUTPUT
30
4
16
5