Basic C# Programming Language - part IV (Full Code Pembahasan Looping IF-Else dan Switch-Case)
بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيم
Melanjutkan posting saya sebelumnya tentang pembahasan Tipe Data sekarang saatnya belajar perulangan dengan For, Foreach, while, DoWhile dan juga Kondisional Operator IF-Else, Switch-Case by practice code tentunya. seperti biasa buat sebuah project console app di visual studio kemudian masukkan kode program berikut. baca dan pahami :)
Read Code and Write Your Own Code !
using System;
namespace IterationsAndDecisions
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("***** Loops and Choices *****\n");
//ForAndForEachLoop();
//VarInForeachLoop();
//ExecuteWhileLoop();
//ExecuteDoWhileLoop();
//ExecuteIfElse();
//ExecuteIfElseUsingConditionalOperator();
//ExecuteSwitch();
//ExecuteSwitchOnString();
//SwitchOnEnumExample();
//ExecutePatternMatchingSwitch();
ExecutePatternMatchingSwitchWithWhen();
Console.ReadLine();
}
#region For / foreach loops
// A basic for loop.
static void ForAndForEachLoop()
{
// Note! "i" is only visible within the scope of the for loop.
for (int i = 0; i < 4; i++)
{
Console.WriteLine("Number is: {0} ", i);
}
// "i" is not visible here.
Console.WriteLine();
string[] carTypes = {"Ford", "BMW", "Yugo", "Honda"};
foreach (string c in carTypes)
Console.WriteLine(c);
Console.WriteLine();
int[] myInts = {10, 20, 30, 40};
foreach (int i in myInts)
Console.WriteLine(i);
Console.WriteLine();
}
#endregion
#region Var keyword in foreach
static void VarInForeachLoop()
{
int[] myInts = {10, 20, 30, 40};
// Use "var" in a standard foreach loop.
foreach (var item in myInts)
{
Console.WriteLine("Item value: {0}", item);
}
Console.WriteLine();
}
#endregion
#region while loop
static void ExecuteWhileLoop()
{
string userIsDone = "";
// Test on a lower-class copy of the string.
while (userIsDone.ToLower() != "yes")
{
Console.Write("Are you done? [yes] [no]: ");
userIsDone = Console.ReadLine();
Console.WriteLine("In while loop");
}
Console.WriteLine();
}
#endregion
#region do/while loop
static void ExecuteDoWhileLoop()
{
string userIsDone = "";
do
{
Console.WriteLine("In do/while loop");
Console.Write("Are you done? [yes] [no]: ");
userIsDone = Console.ReadLine();
} while (userIsDone.ToLower() != "yes"); // Note the semicolon!
Console.WriteLine();
}
#endregion
#region If/else
static void ExecuteIfElse()
{
string stringData = "My textual data";
if (stringData.Length > 0)
{
Console.WriteLine("string is greater than 0 characters");
}
else
{
Console.WriteLine("string is not greater than 0 characters");
}
Console.WriteLine();
}
private static void ExecuteIfElseUsingConditionalOperator()
{
string stringData = "My textual data";
Console.WriteLine(stringData.Length > 0
? "string is greater than 0 characters"
: "string is not greater than 0 characters");
Console.WriteLine();
}
#endregion
#region C# 6 switch statements
// Switch on a numerical value.
static void ExecuteSwitch()
{
Console.WriteLine("1 [C#], 2 [VB]");
Console.Write("Please pick your language preference: ");
string langChoice = Console.ReadLine();
int n = int.Parse(langChoice);
switch (n)
{
case 1:
Console.WriteLine("Good choice, C# is a fine language.");
break;
case 2:
Console.WriteLine("VB: OOP, multithreading, and more!");
break;
default:
Console.WriteLine("Well...good luck with that!");
break;
}
Console.WriteLine();
}
static void ExecuteSwitchOnString()
{
Console.WriteLine("C# or VB");
Console.Write("Please pick your language preference: ");
string langChoice = Console.ReadLine();
switch (langChoice)
{
case "C#":
Console.WriteLine("Good choice, C# is a fine language.");
break;
case "VB":
Console.WriteLine("VB: OOP, multithreading and more!");
break;
default:
Console.WriteLine("Well...good luck with that!");
break;
}
Console.WriteLine();
}
static void SwitchOnEnumExample()
{
Console.Write("Enter your favorite day of the week: ");
DayOfWeek favDay;
try
{
favDay = (DayOfWeek) Enum.Parse(typeof(DayOfWeek), Console.ReadLine());
}
catch (Exception)
{
Console.WriteLine("Bad input!");
return;
}
switch (favDay)
{
case DayOfWeek.Sunday:
Console.WriteLine("Football!!");
break;
case DayOfWeek.Monday:
Console.WriteLine("Another day, another dollar");
break;
case DayOfWeek.Tuesday:
Console.WriteLine("At least it is not Monday");
break;
case DayOfWeek.Wednesday:
Console.WriteLine("A fine day.");
break;
case DayOfWeek.Thursday:
Console.WriteLine("Almost Friday...");
break;
case DayOfWeek.Friday:
Console.WriteLine("Yes, Friday rules!");
break;
case DayOfWeek.Saturday:
Console.WriteLine("Great day indeed.");
break;
}
Console.WriteLine();
}
public static void SwitchWithGoto()
{
var foo = 5;
switch (foo)
{
case 1:
//do something
goto case 2;
case 2:
//do something else
break;
case 3:
//yet another action
goto default;
default:
//default action
break;
}
}
#endregion
#region C# 7 switch statements
static void ExecutePatternMatchingSwitch()
{
Console.WriteLine("1 [Integer (5)], 2 [String (\"Hi\")], 3 [Decimal (2.5)]");
Console.Write("Please choose an option: ");
string userChoice = Console.ReadLine();
object choice;
//This is a standard constant pattern switch statement to set up the example
switch (userChoice)
{
case "1":
choice = 5;
break;
case "2":
choice = "Hi";
break;
case "3":
choice = 2.5;
break;
default:
choice = 5;
break;
}
//This is new the pattern matching switch statement
switch (choice)
{
case int i:
Console.WriteLine("Your choice is an integer {0}.",i);
break;
case string s:
Console.WriteLine("Your choice is a string. {0}", s);
break;
case decimal d:
Console.WriteLine("Your choice is a decimal. {0}", d);
break;
default:
Console.WriteLine("Your choice is something else");
break;
}
Console.WriteLine();
}
static void ExecutePatternMatchingSwitchWithWhen()
{
Console.WriteLine("1 [C#], 2 [VB]");
Console.Write("Please pick your language preference: ");
object langChoice = Console.ReadLine();
var choice = int.TryParse(langChoice.ToString(), out int c) ? c : langChoice;
switch (choice)
{
case int i when i == 2:
case string s when s.Equals("VB", StringComparison.OrdinalIgnoreCase):
Console.WriteLine("VB: OOP, multithreading, and more!");
break;
case int i when i == 1:
case string s when s.Equals("C#", StringComparison.OrdinalIgnoreCase):
Console.WriteLine("Good choice, C# is a fine language.");
break;
default:
Console.WriteLine("Well...good luck with that!");
break;
}
Console.WriteLine();
}
#endregion
}
}
ٱلْـحَـمْـدُ للهِ
