static void Main(string[] args) { //int[] array = new int[] { 1, 2, 3, 4 }; //int[][] jagged = { new int[] { 1, 2, 3 }, new int[] { 1 }, new int[] { 5, 5, 5, 5, 5 } }; //int[,] arr =new int[,] { { 1, 2, 3 }, { 4, 5, 6 } }; //int l = arr.GetLength(1); //Student student = new Student("Ivan Petrov", 25); //Student student1 = new Student(); //Student student2 = new Student(student); //Console.WriteLine(student.ToString()); //Console.WriteLine(student1); //Console.WriteLine(student2); //Random rnd = new Random(); //int[] arr2 = new int[] { 1, 2, 3, 4 }; //int[] arr3 = new int[arr2.Length]; //Array.Copy(arr2, arr3, arr2.Length); //arr3[0] = 777; //Console.WriteLine(arr2[0]); //Console.WriteLine(arr3[0]); Student student5 = new Student("Ivan Petrov",24,1600); Console.WriteLine(student5.AgeInFee()); Console.WriteLine("The first letter of the name is {0}", student5.Firstchar()); Console.WriteLine("Fee: {0}", student5.Fee); StudentExtension.IncreaseFee(student5, 15); Console.WriteLine("Fee increased with 15%: {0}", student5.Fee); Student one = new StudentExt("Georgi", 24, 1600,"Male"); one.Talk(); }