VB.Net - Data Types

Data types refer to an extensive system used for declaring variables or functions of different types. The type of a variable determines how much space it occupies in storage and how the bit pattern stored is interpreted.
VB.Net provides a wide range of data types. The following table shows all the data types available −
-1.79769313486231570E+308 through -4.94065645841246544E-324, for negative values
4.94065645841246544E-324 through 1.79769313486231570E+308, for positive values
4 bytes on 32-bit platform
8 bytes on 64-bit platform
-3.4028235E+38 through -1.401298E-45 for negative values;
1.401298E-45 through 3.4028235E+38 for positive values
The following example demonstrates use of some of the types −
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
When the above code is compiled and executed, it produces the following result −
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

VB.Net provides the following in-line type conversion functions −
CBool(expression)
Converts the expression to Boolean data type.
CByte(expression)
Converts the expression to Byte data type.
CChar(expression)
Converts the expression to Char data type.
CDate(expression)
Converts the expression to Date data type
CDbl(expression)
Converts the expression to Double data type.
CDec(expression)
Converts the expression to Decimal data type.
CInt(expression)
Converts the expression to Integer data type.
CLng(expression)
Converts the expression to Long data type.
CObj(expression)
Converts the expression to Object type.
CSByte(expression)
Converts the expression to SByte data type.
CShort(expression)
Converts the expression to Short data type.
CSng(expression)
Converts the expression to Single data type.
CStr(expression)
Converts the expression to String data type.
CUInt(expression)
Converts the expression to UInt data type.
CULng(expression)
Converts the expression to ULng data type.
CUShort(expression)
Converts the expression to UShort data type.
The following example demonstrates some of these functions −
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
When the above code is compiled and executed, it produces the following result −
True
-1
True
12/4/2012
1
1


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