static void main(String[] args) { int?num2 = 45; Rectangle r = new Rectangle(); r.length = 5; r.width = 2; r.Display(); int max = r.FindMax(r.length, r.width); Console.ReadKey(); r.Factorial(4); // Initialization of array int [] marks = new int[5] { 1, 2, 3, 4, 5 }; for (int i = 0; i < 5; i++) { Console.WriteLine("Element {0}: {1}", i, marks[i]); } foreach (int j in n) { } }