Fibonacci.cs

class Program
{
    static void Main(string[] args)
    {
        var iter = rl("Iterations:");
        var iterInt = Convert.ToInt32(iter);
        long val1 = 0;
        long val2 = 1;
        for (int i = 1; i < iterInt; i++) {
            long calc = val1 + val2;
            if (i == iterInt-1) {
                w(calc);
            } else {
                w(calc, ",");
            }
            val1 = val2;
            val2 = calc;
        }
        wl("");
        rl("press any key to exit");
    }

    static void w(long txt, string separator = "") => Console.Write(txt.ToString() + separator);
    static void wl(string txt) => Console.WriteLine(txt);
    static void wl(int txt) => Console.WriteLine(txt.ToString());

    static string rl(string txt)
    {
        wl(txt);
        return Console.ReadLine();
    }
}