Fibonacci calculation example (Top-Level statement style)

fibonacci.cs

var n = 10;
var fib = new List<long> { 0, 1, };

for (var i = 2; i < n; i++)
	fib.Add(fib[i - 1] + fib[i - 2]);

Console.WriteLine($"Fibonacci sequence up to {n} terms:");
Console.WriteLine(string.Join(", ", fib));