PROGRAM TO DEVELOP A CALCULATOR IN C-SHARP

PROGRAM TO DEVELOP A CALCULATOR IN C-SHARP BY USING CLASS

BEGIN
 
using System;

    class test
    {
        public void add()
        {
            Console.WriteLine("enter 2 number");
            int n1 = int.Parse(Console.ReadLine());
            int n2 = int.Parse(Console.ReadLine());
            Console.WriteLine(n1+n2);
          
        }
        public void sub()
        {
            Console.WriteLine("enter 2 number");
            int n1 = int.Parse(Console.ReadLine());
            int n2 = int.Parse(Console.ReadLine());
            Console.WriteLine(n1 - n2);

        }
        public void mul()
        {
            Console.WriteLine("enter 2 number");
            int n1 = int.Parse(Console.ReadLine());
            int n2 = int.Parse(Console.ReadLine());
            Console.WriteLine(n1 * n2);

        }
        public void div()
        {
            Console.WriteLine("enter 2 number");
            int n1 = int.Parse(Console.ReadLine());
            int n2 = int.Parse(Console.ReadLine());
            Console.WriteLine(n1 / n2);

        }
        public static void Main()
        {
            Console.WriteLine("1-add 2-sub 3-multiply 4-divide");
            int choice = int.Parse(Console.ReadLine());
            if (choice == 1)
            {
                test obj = new test();
                obj.add();
            }
            else if (choice == 2)
            {
                test obj = new test();
                obj.sub();
            }
            else if (choice == 3)
            {
                test obj = new test();
                obj.mul();
            }
            else if (choice == 4)
            {
                test obj = new test();
                obj.div();
            }
        }
    }
    END