[ Telerik C#] Primitives And Variables - EX 11

/*Declare  two integer variables and assign them with 5 and 10 and after that exchange their values.*/
using System;

namespace _11_IntegerExchange
{
    class IntegerExchange
    {
        static void Main()
        {
            int a = 5;
            int b = 10;
            int c;

            Console.WriteLine("First number:{0} , Second number:{1}", a, b);
            c = a;
            a = b;
            b = c;
            Console.WriteLine();
            Console.WriteLine("After Exchange: ");
            Console.WriteLine("First number:{0} , Second number:{1}", a, b);

            Console.WriteLine();

            // Or without using 3th variable.
            //The problem with this 2nd method is that it can cause overflow if the variables contain too big integers
            a = 5;
            b = 10;
            Console.WriteLine("First number:{0} , Second number:{1}", a, b);

            a = a + b;
            b = a - b;
            a = a - b;
            Console.WriteLine();
            Console.WriteLine("After Exchange: ");
            Console.WriteLine("First number:{0} , Second number:{1}", a, b);
        }
    }
}