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using System; using System.Text; namespace Mains { class Program { static int Main(string[] args) { //--- reading args of main for (int i = 0; i < args.Length; i++) { Console.WriteLine("Arg: {0}", args[i]); } // or foreach (string arg in args) Console.WriteLine("Arg: {0},{1}", arg, 123); //or System.Enviroment Console.WriteLine("True {0}", bool.TrueString); //--- char char myChar = 'a'; if (char.IsDigit(myChar)) { Console.WriteLine("digit"); } //--- parse from string bool b = bool.Parse("true"); //--- dateTime DateTime dt = new DateTime(2017, 08, 20); Console.WriteLine(dt.DayOfWeek); string s = "someString"; if (s.Contains("some")) {/*do something*/ } Console.Write("beep\a\n\r"); Console.WriteLine("beep\a\n\r"); //--- verabtim strings Console.Write(@"some\Dir\"); // will // string builder using System.Text StringBuilder sb = new StringBuilder(); sb.Append("\n"); sb.AppendLine("Line1"); sb.AppendLine("Line2"); sb.AppendLine("Line3"); Console.WriteLine(sb.ToString()); // Convert byte myByte = 0; int myInt = 200; myByte = Convert.ToByte(myInt); Console.WriteLine("Value of my Byte {0}", myByte); //----- narrowing and checked directive short myShort; int myInt1 = 100000000; // myShort = myInt1; // Severity Code Description Project File Line Suppression State //Error CS0266 Cannot implicitly convert type 'int' to 'short'.An explicit conversion exists (are you missing a cast?) Mains C:\C#\MyC#StudyProjects\07_DifferentMains\Mains\Mains\Program.cs 64 Active try { checked { myShort = (short)myInt1; } } //{ checked { myShort = Convert.ToUInt16(myInt1); } } catch (OverflowException ex) { Console.WriteLine(ex.Message); } //----- var directive var myInt2 = 0; var myBool = true; var myString = "string"; Console.WriteLine(myInt2.GetType().Name); Console.WriteLine(myBool.GetType().Name); Console.WriteLine(myString.GetType().Name); // for for (var i = 0; i < 10; i++) { /*do something*/} //foreach int[] intArray = { 0, 1, 2, 3 }; foreach (var i in intArray) { /*do something*/} //while var j = 0; while (j < 10) { j++; } //do while do { j++; } while (j < 10); // if else if (j < 10) { } else if (j == 10) { } else if (j == 1) { }; // and or not && || ! if ( (j<=10) && (j>=11) ){ } if ((j <= 10) || (j >= 12)) { } if ((j != 12) || (j >= 12)) { } //switch var n = 12; switch (n) { case 1: { };break; case 2: { };break; default: { };break; } //---------- Console.ReadLine(); return -1; } } } |