17.00 Exchange Variable Values

using System;
class Program
{
    static void Main()
    {
        int a = int.Parse(Console.ReadLine());
        int b = int.Parse(Console.ReadLine());
        Console.WriteLine("Before:\na = {0}\nb = {1}", a, b);

        int c = b;
        b = a;
        a = c;
        Console.WriteLine("After:\na = {0}\nb = {1}", a, b);
    }
}