using System;

public class Program

{

    public static void Main()

    {

         int a = 21;

         int b = 10;

         int c;

​

         c = a + b;

         Console.WriteLine("Line 1 - Value of c is {0}", c);

         c = a - b;

         Console.WriteLine("Line 2 - Value of c is {0}", c);

         c = a * b;

         Console.WriteLine("Line 3 - Value of c is {0}", c);

         c = a / b;

         Console.WriteLine("Line 4 - Value of c is {0}", c);

         c = a % b;

         Console.WriteLine("Line 5 - Value of c is {0}", c);

         c = a++;

         Console.WriteLine("Line 6 - Value of c is {0}", c);

         c = a--;

         Console.WriteLine("Line 7 - Value of c is {0}", c);

         Console.ReadLine();

      }

   }