Here is some basic, simple, handy C# programs for you to enjoy and refresh your memory -
using GroundCSApp; using System; using System.Collections.Generic; using System.Linq; namespace GroundCSApp { public enum ShippingMethod { Regular = 1, Priority = 2, Snail = 3 } class Program { static void Main(string[] args) { //------------------------------------------------------- //non -primitive/reference type eg: number //array creation and assignment var numbers = new int[3]; numbers[0] = 23; var numbers2 = numbers; numbers[0] = 24; Console.WriteLine("Value of variable numbers is changed
and it is >>" + numbers[0]); //-------------------------------------------------------- //-------------------------------------------------------- //non-primitive, immutable, string array creation assignment var names = new string[3] { "John", "Luke", "Mark" }; //String Join example var joinedName = string.Join(",", names); Console.WriteLine("\n\n" + joinedName); var strArray = new string[] { "Text", "Book", "Light" }; var strArray2 = strArray; //example for reference type where //original value is modified strArray2[0] = "Candle"; var comb = string.Join(",", strArray); Console.WriteLine(comb); //-------------------------------------------------------- //-------------------------------------------------------- //simple object creation and method call //Example::1 var John = new Person(); John.FirstName = "John"; John.LastName = "Jiss"; John.Introduce(); //Example::2 var cal = new Calculator(); Console.WriteLine(cal.Add(23, 34) + "" + numbers[0]); //-------------------------------------------------------- //-------------------------------------------------------- //Using Enums var method = ShippingMethod.Priority; Console.WriteLine((int)method); var methodExt = 3; Console.WriteLine((ShippingMethod)methodExt); var shippingstr = "Snail"; var shippingM = (ShippingMethod)Enum.Parse
(typeof(ShippingMethod), shippingstr); Console.WriteLine(shippingM); //-------------------------------------------------------- //-------------------------------------------------------- //Simple Console Read and output while (true) { Console.WriteLine("\n\nEnter your name, we will
display it :) >>"); var input = Console.ReadLine(); if (!string.IsNullOrWhiteSpace(input)) { Console.WriteLine("Your name is>>" + input); break; } continue; } //-------------------------------------------------------- //-------------------------------------------------------- //Simple program snippet to Find Mode var cnt3 = 0; for (var i = 1; i <= 100; i++) { if (i % 3 == 0) { cnt3++; } } Console.WriteLine("\nCount of mod 3s in 100 is>>" + cnt3); //-------------------------------------------------------- //-------------------------------------------------------- //Simple Console program snippet to find sum of numbers Console.WriteLine("\n\nEnter your numbers with new line
to find the sum. Press 'ok' to exit>>"); var numsum = 0; while (true) { var s = Console.ReadLine(); if (s == "ok") { Console.WriteLine("\n\nYour sum is>> " + numsum); break; } else { numsum += Convert.ToInt32(s); } } //-------------------------------------------------------- //-------------------------------------------------------- //Simple Console program snippet to find factorial Console.WriteLine("\n\nEnter number to find factorial>>"); var factorial = Convert.ToInt32(Console.ReadLine()); var factans = 1; for (var i = factorial; i >= 1; i--) { factans = factans * i; } Console.WriteLine("\n " + factorial + "! = " + factans); //-------------------------------------------------------- //-------------------------------------------------------- //Simple program snippet for array sort var numar = new[] { 2, 3, 4, 5, 2, 1 }; Array.Sort(numar); foreach (var i in numar) { Console.WriteLine(i); } Console.WriteLine("\n\n"); //-------------------------------------------------------- //-------------------------------------------------------- //Simple program snippet for list operartions var numberslst = new List<int>() { 1, 2, 3, 4, 5 }; numberslst.Add(1); numberslst.AddRange(new int[3] { 6, 7, 8 }); foreach (var numb in numberslst) { Console.WriteLine(numb); } Console.WriteLine(numberslst.IndexOf(1)); Console.WriteLine(numberslst.LastIndexOf(1)); for (var i = 0; i < numberslst.Count; i++) { if (numberslst[i] == 1) { numberslst.Remove(numberslst[i]); } } Console.WriteLine("\n\n"); foreach (var num in numberslst) { Console.WriteLine(num); } //End list operations //-------------------------------------------------------- //-------------------------------------------------------- //Simple implementation of Facebook style Like status Console.WriteLine("\n\nPlease enter unique names to find
your like status. Press ok to exit>>"); var namlst = new List<string>(); while (true) { var namelst = Console.ReadLine(); if (namlst.Count > 0 && namlst.Contains(namelst)) { Console.WriteLine("\nPlease enter unique names>>"); } else if (namelst != "ok") { namlst.Add(namelst); } else { if (namlst.Count > 0) { Console.WriteLine("******************\n\n"); for (var i = 0; i < namlst.Count; i++) { if (i == 0) { Console.WriteLine("You have likes from > "); } Console.WriteLine("[" + namlst[i] + (i + 1) + "] "); } } else { Console.WriteLine("\nYou have no likes!"); } break; } } //-------------------------------------------------------- //-------------------------------------------------------- //Simple program snippet to Reverse String Console.WriteLine("\n\nEnter your name\n\n>>"); var namarre = Console.ReadLine(); var namarry = new string[namarre.Length]; for (var i = 0; i < namarre.Length; i++) { namarry[i] = namarre[i].ToString(); } Array.Reverse(namarry); Console.WriteLine("\nString reversed is as below>>\n\n"); foreach (var nami in namarry) { Console.WriteLine(nami); } //-------------------------------------------------------- //-------------------------------------------------------- //Simple program snippet to capture first 5 numbers, //sort it and display it var numplLst = new List<int>(); Console.WriteLine("\n\nEnter numbers, we will capture first
5 numbers and will sort and display it >>\n"); while (true) { var innum = Console.ReadLine(); int numval = 0; try { numval = Convert.ToInt32(innum); } catch (FormatException e) { Console.WriteLine("\nThe input need to be a number"); } catch (OverflowException e) { Console.WriteLine("\nThe input cannot be fit in as a number"); } if (numplLst.Count == 5) { numplLst.Sort(); Console.WriteLine("\nHurray you have entered 5 numbers
and here it is sorted>>\n\n"); foreach (var i in numplLst) { Console.WriteLine(i); } break; } else { if (numplLst.Contains(numval)) { Console.WriteLine("\nNumber already exist in the
list, please enter unique value>>"); } else { numplLst.Add(numval); } } } //-------------------------------------------------------- //-------------------------------------------------------- //Simple console program snippet to //accept numbers and display unique numbers var innums = new List<int>(); Console.WriteLine("\n\nEnter any numbers until 'Quit', we will
display unique numbers>>"); while (true) { var inm = Console.ReadLine(); var ret = 0; try { ret = Convert.ToInt32(inm); } catch (FormatException e) { Console.WriteLine("\nPlease enter a number!"); } catch (OverflowException e) { Console.WriteLine("\nNumber cannot be fit into the stack!"); } if (inm == "Quit") { var reslst = innums.Distinct().ToList(); Console.WriteLine("\nYour unique list is>>\n\n"); foreach (var ls in reslst) { Console.WriteLine(ls); } break; } innums.Add(ret); } //-------------------------------------------------------- //-------------------------------------------------------- //Simple console program snippet to get numbers and then display //first 3 lowest numbers Console.WriteLine("\\nEnter a list of numbers separated by comma,
we will display the first 3 lowest numbers>>"); while (true) { var intls = Console.ReadLine(); var inlst = new string[] { }; var inlstint = new int[5]; inlst = intls.Split(','); var trybrk = false; var j = 0; foreach (var i in inlst) { //Console.WriteLine(i); try { var con = Convert.ToInt32(i); } catch (FormatException e) { trybrk = true; } Console.WriteLine(i); inlstint[j++] = Convert.ToInt32(i); } if (trybrk) { Console.WriteLine("\nList can only contain numbers!
Please re-enter the list>"); } else { if (inlst.Length == 5) { Array.Sort(inlstint); Console.WriteLine("\n\nFirst 3 smallest numbers are>>\n"); for (var i = 0; i < inlstint.Length; i++) { if (i < 3) { Console.WriteLine(inlstint[i]); } else { break; } } break; } else { Console.WriteLine("\nPlease have 5 numbers in the list.
Try again>>"); Console.WriteLine("\\nEnter a list numbers separated
by comma>>");
}
}
}
}
}
}
