VB.Net - Data type

May 13, 2021 vb.net

1. Vb. T he type of data provided in Net

3. Vb. The type conversion function in Net

A data type is an extended system that declares different types of variables or functions. T he type of variable determines how much space it takes up in storage and how it interprets the stored bit pattern.

Vb. T he type of data provided in Net

Vb. N et offers a variety of data types. A ll data types shown in the following table are available:

The data type	Storage allocation	The range of values
Boolean	Depends on the implementation platform	True or false
Byte	1 byte	0 to 255 (unsigned)
Char	2 bytes	0 to 65535 (unsigned)
Date	8 bytes	00:00:00 (midnight) from 11:31 to 11:59:59 on 31 December 0001
Decimal	16 bytes	0 to 79,228,162,514,264,337,593,543,950,335 (-/- 7.9 ... E plus 28), no number of points; 0 to 7.92281625142643375935439550335, where there are 28 bits to the right of the dodge point
Double	8 bytes	-1.79769313486231570E , 308 to -4.94065645841246544E-324, negative values 4.94065645841246544E-324 to 1.79769313486231570E and 308, for positive values
Integer	4 bytes	-2,147,483,648 to 2,147,483,647 (symbol)
Long	8 bytes	-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 (signature)
Object	4 bytes on a 32-bit platform 8 bytes on a 64-bit platform	Any type can be stored in a variable of the Object type
SByte	1 byte	-128 to 127 (signature)
Short	2 bytes	-32,768 to 32,767 (signature)
Single	4 bytes	-3.4028235E plus 38 to -1.401298E-45 is negative; 1.401298E-45 to 3.4028235E plus 38 positive
String	Depends on the implementation platform	0 to about 2 billion Unicode characters
UInteger	4 bytes	0 to 4294967295 (unsigned)
ULONG	8 bytes	0 to 18,446,744,073,709,551,615 (signature)
User-Defined	Depends on the implementation platform	Each member of the structure has a range determined by its data type and is independent of the scope of the other members
UShort	2 bytes	0 to 65,535 (unsigned)

Example

The following example shows some of the types that use

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 results:

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. The type conversion function in Net

Vb. N et provides the following inline type conversion functions:

SN	Features and instructions
1	CBool (Expression) Convert the expression to a Boolean data type.
2	CByte (Expression) Convert the expression to a byte data type.
3	CChar (Expression) Convert the expression to a Char data type.
4	CD ate (expression) Convert the expression to a Date data type
5	CDbl (Expression) Convert an expression to a double data type.
6	CDec (Expression) Convert an expression to a hedding data type.
7	CInT (Expression) Convert an expression to an integer data type.
8	CLng function (expression) Convert an expression to a long data type.
9	CObj (Expression) Convert an expression to an object type.
10	CSByte (Expression) Convert the expression to a SByte data type.
11	CShort (Expression) Convert an expression to a short data type.
12	CSng function (expression) Convert an expression to a single data type.
13	CStr's (expression) Converts an expression to a string data type.
14	CUInt (Expression) Convert the expression to a UInt data type.
15	CULng (Expression) Convert the expression to a ULng data type.
16	CUShort (Expression) Convert the expression to a UShort data type.

Example:

The following example demonstrates some of these features:

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