static void Main(string[] args) { Dictionary <string, Student> stu = new Dictionary <string, Student>(); for (int i = 1; i < 5; i++) { Student a = new Student(2); a.Name = "S_" + i.ToString(); a.Score = 100; stu.Add(a.Name, a); } Student kk = stu["S_3"]; Console.WriteLine(kk.Name); int[] myarry = new int[] { 1, 2, 3, 4, 5 }; CC c = new CC(); Action myway = new Action(c.sayholle); myway(); Console.WriteLine(myarry[3]); Type t = typeof(double); Console.WriteLine(t.Namespace); Console.WriteLine(t.FullName); Console.WriteLine(t.Name); int len = t.GetMethods().Length; //foreach (var mi in t.GetMethods()) //{ // Console.WriteLine(mi.Name); //} int x = default(int); Console.WriteLine(x); CC mycc = default(CC); Console.WriteLine(mycc == null); level l = default(level); Console.WriteLine(l); var p = 44.4; Console.WriteLine(p.GetType().Name); Form myform = new Form() { Text = "holle" }; //myform.ShowDialog(); var person = "hr"; Console.WriteLine(person); kk.report(); people kkk = new people(); kkk.report(); uint max = uint.MaxValue; Console.WriteLine(max); string binmax = Convert.ToString(max, 2); Console.WriteLine(binmax); try { uint y = checked (max + 1); Console.WriteLine(y); } catch (OverflowException ex) { Console.WriteLine(ex.ToString()); } int o = int.MinValue; int o1 = -o; Console.WriteLine(o1); int n = 12345678; int m = -n; string nstr = Convert.ToString(n, 2).PadLeft(32, '0'); string mstr = Convert.ToString(m, 2).PadLeft(32, '0'); Console.WriteLine(nstr); Console.WriteLine(mstr); //string d = Console.ReadLine(); //string e = Console.ReadLine(); //Console.WriteLine(Convert.ToInt32(d)+Convert.ToInt32(e)); //Console.WriteLine(Int32.Parse(d)+Int32.Parse(e)); Console.WriteLine(56 is Int32); // Nullable<int> j = null; //j = 100; int?j = null; j = 100; Console.WriteLine(j.Value); Console.WriteLine(j.HasValue); int?h = null; h = 88; int g = h ?? 5; Console.WriteLine(g); //holle: Console.WriteLine("holle hr"); // goto holle; Calculator cc = new Calculator(); int r = 0; try { r = cc.Add("abc", "100"); } catch (Exception) { throw; } Console.WriteLine(r); Student stu2 = new Student(1); Console.WriteLine(stu2.id); //stu2.id = 2; try { Student stu3 = new Student(3); stu3.Age = 20; Student stu4 = new Student(4); stu4.Age = 20; Student stu5 = new Student(5); stu5.Age = 20; int avgAge = (stu3.Age + stu4.Age + stu5.Age) / 3; Console.WriteLine(avgAge); } catch (Exception ex) { Console.WriteLine(ex.Message); throw; } student stu1 = new student(); stu1["math"] = 90; var mathscore = stu["math"]; Console.WriteLine(mathscore == null); }