public static void Main(String[] args)
int firstnum, secondnum, temp;
Console.WriteLine("input first num:");
firstnum = int.Parse(Console.ReadLine());
Console.WriteLine("input second num:");
secondnum = int.Parse(Console.ReadLine());
Console.WriteLine("Before Swapping");
Console.WriteLine("first num ="+firstnum);
Console.WriteLine("second num ="+secondnum);
Console.WriteLine("Values after swapping are:");
Console.WriteLine("first num="+firstnum);
Console.WriteLine("second num="+secondnum);