using System;

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   public  class Calculator

    {

        public  static void Main()

        {

            int n1, n2, opt_menu;

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            Console.Write("day1 assignment simple calculator:\n");

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            Console.Write("\n\n");

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            Console.Write("Enter 1st number :");

            n1 = Convert.ToInt32(Console.ReadLine());

            Console.Write("Enter 2nd number:");

            n2 = Convert.ToInt32(Console.ReadLine());

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            Console.Write("\n Simple calculator menu :\n");

            Console.Write("1-Addition.\n2-Substraction.\n3-Multiplication.\n4-Division.\n5-Exit.\n");

            Console.Write("\nchoose 1 option :");

            opt_menu = Convert.ToInt32(Console.ReadLine());

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            switch (opt_menu)

            {

                case 1:

                    Console.Write("The Addition of  {0} and {1} is: {2}\n", n1, n2, n1 + n2);

                    break;

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                case 2:

                    Console.Write("The Substraction of {0}  and {1} is: {2}\n", n1, n2, n1 - n2);

                    break;

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                case 3:

                    Console.Write("The Multiplication of {0}  and {1} is: {2}\n", n1, n2, n1 * n2);

                    break;

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                case 4:

                    if (n2 == 0)

                    {

                        Console.Write("The second integer is zero. Devide by zero.\n");

                    }

                    else

                    {

                        Console.Write("The Division of {0}  and {1} is : {2}\n", n1, n2, n1 / n2);

                    }

                    break;

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                case 5:

                    break;

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                default:

                    Console.Write("choose correct option\n");

                    break;

            }

        }

    }

​

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