Einführung und erstes Programm

dotnet new console -lang VB -o hallo    # Projekt anlegen
cd hallo && dotnet run                  # bauen und starten
dotnet build                            # nur bauen
dotnet add package Newtonsoft.Json      # NuGet-Paket

Module Program
    Sub Main()
        Console.WriteLine("Hallo, Welt!")
        Console.WriteLine("1 + 2 = " & (1 + 2))
        Console.Write("ohne Zeilenumbruch")
        Console.WriteLine()
        Dim name As String = "Mia"
        Console.WriteLine("Hallo, " & name & "!")
        Console.WriteLine($"Interpoliert: {name} hat {name.Length} Buchstaben")
        Console.WriteLine("{0} ist {1} Jahre alt", name, 17)
    End Sub
End Module

Hallo, Welt!
1 + 2 = 3
ohne Zeilenumbruch
Hallo, Mia!
Interpoliert: Mia hat 3 Buchstaben
Mia ist 17 Jahre alt

Module Program
    Sub Main()
        Dim alter As Integer = 17
        Dim preis As Double = 9.99
        Dim name As String = "Mia"
        Dim ok As Boolean = True
        Dim z As Char = "z"c
        Dim gross As Long = 9000000000L
        Dim dezimal As Decimal = 1.5D
        Dim datum As Date = #3/15/2024#
        Const MAXIMUM As Integer = 100

        Console.WriteLine($"{alter} {preis} {name} {ok} {z}")
        Console.WriteLine($"{gross} {dezimal} {datum:yyyy-MM-dd} {MAXIMUM}")
        Console.WriteLine(alter.GetType().Name & " " & preis.GetType().Name & " " & name.GetType().Name)

        Dim x = 5               ' Typinferenz
        Dim y = 2.5
        Console.WriteLine(x.GetType().Name & " " & y.GetType().Name)
        Console.WriteLine(Integer.MaxValue)
        Console.WriteLine(Double.MaxValue > 1.0E+300)
        Dim nichts As String = Nothing
        Console.WriteLine(nichts Is Nothing)
        Console.WriteLine(String.IsNullOrEmpty(nichts))
    End Sub
End Module

17 9.99 Mia True z
9000000000 1.5 2024-03-15 100
Int32 Double String
Int32 Double
2147483647
True
True
True

Module Program
    Sub Main()
        Console.WriteLine(7 + 2)
        Console.WriteLine(7 - 2)
        Console.WriteLine(7 * 2)
        Console.WriteLine(7 / 2)       ' / liefert immer Double
        Console.WriteLine(7 \ 2)       ' \ ist die Ganzzahldivision
        Console.WriteLine(7 Mod 3)
        Console.WriteLine(2 ^ 10)      ' ^ ist die Potenz (Double)
        Console.WriteLine(Math.Sqrt(16))
        Console.WriteLine(Math.Abs(-5))
        Console.WriteLine(Math.Max(3, 9))
        Console.WriteLine(Math.Round(2.5))
        Console.WriteLine(Math.Round(3.5))
        Console.WriteLine(Math.Floor(-2.1))
        Console.WriteLine(Math.Ceiling(2.1))
        Console.WriteLine(CInt(3.7))
        Console.WriteLine(CDbl("3.5") * 2)
        Console.WriteLine(CStr(42) & "!")
        Console.WriteLine(Int(3.99))
        Console.WriteLine(Math.PI.ToString("F4"))
        Dim a As Integer = 5
        a += 3
        a *= 2
        Console.WriteLine(a)
        Console.WriteLine(12 And 10)
        Console.WriteLine(12 Or 10)
        Console.WriteLine(12 Xor 10)
        Console.WriteLine(1 << 4)
        Console.WriteLine(256 >> 4)
        Console.WriteLine(0.1 + 0.2)
        Console.WriteLine(0.1D + 0.2D)
    End Sub
End Module

9
5
14
3.5
3
1
1024
4
5
9
2
4
-3
3
4
7
42!
3
3.1416
16
8
14
6
16
16
0.30000000000000004
0.3