Tipe data mengacu pada sistem yang luas digunakan untuk mendeklarasikan variabel atau fungsi dari berbagai jenis. Jenis variabel menentukan berapa banyak ruang yang menempati di penyimpanan dan bagaimana pola bit disimpan ditafsirkan.
Jenis Data yang tersedia di VB.Net
VB.Net menyediakan berbagai jenis data. Tabel berikut menunjukkan semua jenis data yang tersedia:
| Data Type | Storage Allocation | Value Range |
|---|---|---|
| Boolean | Depends on implementing platform | True or False |
| Byte | 1 byte | 0 through 255 (unsigned) |
| Char | 2 bytes | 0 through 65535 (unsigned) |
| Date | 8 bytes | 0:00:00 (midnight) on January 1, 0001 through 11:59:59 PM on December 31, 9999 |
| Decimal | 16 bytes | 0 through +/-79,228,162,514,264,337,593,543,950,335 (+/-7.9...E+28) with no decimal point; 0 through +/-7.9228162514264337593543950335 with 28 places to the right of the decimal |
| Double | 8 bytes |
-1.79769313486231570E+308 through -4.94065645841246544E-324, for negative values
4.94065645841246544E-324 through 1.79769313486231570E+308, for positive values
|
| Integer | 4 bytes | -2,147,483,648 through 2,147,483,647 (signed) |
| Long | 8 bytes | -9,223,372,036,854,775,808 through 9,223,372,036,854,775,807(signed) |
| Object |
4 bytes on 32-bit platform
8 bytes on 64-bit platform
| Any type can be stored in a variable of type Object |
| SByte | 1 byte | -128 through 127 (signed) |
| Short | 2 bytes | -32,768 through 32,767 (signed) |
| Single | 4 bytes |
-3.4028235E+38 through -1.401298E-45 for negative values;
1.401298E-45 through 3.4028235E+38 for positive values
|
| String | Depends on implementing platform | 0 to approximately 2 billion Unicode characters |
| UInteger | 4 bytes | 0 through 4,294,967,295 (unsigned) |
| ULong | 8 bytes | 0 through 18,446,744,073,709,551,615 (unsigned) |
| User-Defined | Depends on implementing platform | Each member of the structure has a range determined by its data type and independent of the ranges of the other members |
| UShort | 2 bytes | 0 through 65,535 (unsigned) |
Contoh
Contoh berikut menunjukkan penggunaan beberapa jenis:
Module DataTypes
Sub Main()
Dim b As Byte
Dim n As Integer
Dim si As Single
Dim d As Double
Dim da As Date
Dim c As Char
Dim s As String
Dim bl As Boolean
b = 1
n = 1234567
si = 0.12345678901234566
d = 0.12345678901234566
da = Today
c = "U"c
s = "Me"
If ScriptEngine = "VB" Then
bl = True
Else
bl = False
End If
If bl Then
'the oath taking
Console.Write(c & " and," & s & vbCrLf)
Console.WriteLine("declaring on the day of: {0}", da)
Console.WriteLine("We will learn VB.Net seriously")
Console.WriteLine("Lets see what happens to the floating point variables:")
Console.WriteLine("The Single: {0}, The Double: {1}", si, d)
End If
Console.ReadKey()
End Sub
End Module
Ketika kode di atas dikompilasi dan dijalankan, menghasilkan hasil sebagai berikut:
U and, Me
declaring on the day of: 12/4/2012 12:00:00 PM
We will learn VB.Net seriously
Lets see what happens to the floating point variables:
The Single:0.1234568, The Double: 0.123456789012346
Tipe Konversi Fungsi di VB.Net
VB.Net menyediakan fungsi konversi tipe berikut in-line:
| S.N | Functions & Description |
|---|---|
| 1 |
CBool(expression)
Converts the expression to Boolean data type.
|
| 2 |
CByte(expression)
Converts the expression to Byte data type.
|
| 3 |
CChar(expression)
Converts the expression to Char data type.
|
| 4 |
CDate(expression)
Converts the expression to Date data type
|
| 5 |
CDbl(expression)
Converts the expression to Double data type.
|
| 6 |
CDec(expression)
Converts the expression to Decimal data type.
|
| 7 |
CInt(expression)
Converts the expression to Integer data type.
|
| 8 |
CLng(expression)
Converts the expression to Long data type.
|
| 9 |
CObj(expression)
Converts the expression to Object type.
|
| 10 |
CSByte(expression)
Converts the expression to SByte data type.
|
| 11 |
CShort(expression)
Converts the expression to Short data type.
|
| 12 |
CSng(expression)
Converts the expression to Single data type.
|
| 13 |
CStr(expression)
Converts the expression to String data type.
|
| 14 |
CUInt(expression)
Converts the expression to UInt data type.
|
| 15 |
CULng(expression)
Converts the expression to ULng data type.
|
| 16 |
CUShort(expression)
Converts the expression to UShort data type.
|
Contoh:
Contoh berikut menunjukkan beberapa fungsi-fungsi ini:
Module DataTypes Sub Main() Dim n As Integer Dim da As Date Dim bl As Boolean = True n = 1234567 da = Today Console.WriteLine(bl) Console.WriteLine(CSByte(bl)) Console.WriteLine(CStr(bl)) Console.WriteLine(CStr(da)) Console.WriteLine(CChar(CChar(CStr(n)))) Console.WriteLine(CChar(CStr(da))) Console.ReadKey() End Sub End Module
Ketika kode di atas dikompilasi dan dijalankan, menghasilkan hasil sebagai berikut:
True -1 True 12/4/2012 1 1
Done....
Selamat Mencoba :)
Next Page >>> VB.Net - Variables
Sumber : tutorialspoint.com
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