using System;

public class Program

{

    public static void Main()

    {

        int num1,num2;

         int num=0;

        String str;

        Console.WriteLine("Enter integers:\n");

        num1=Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Enter integers:\n");

        num2=Convert.ToInt32(Console.ReadLine());

         Console.WriteLine("Enter the operation to be performed:\n");

        str=Convert.ToString(Console.ReadLine());

        if(str=="ADD")

        {

         num=num1+num2;

            Console.WriteLine("The value is:{0}",num);

        }

        else if(str=="SUB")

        {

            num=num1-num2;

            Console.WriteLine("The value is:{0}",num);

        }

        else if(str=="MUL")

        {

            num=num1*num2;

            Console.WriteLine("The value is:{0}",num);

        }

        else if(str=="DIV")

        {

            num=num1/num2;

            Console.WriteLine("The value is:{0}",num);

        }

        else

        {

        Console.WriteLine("Enter valid option");

        }

    }

}

​