Data Types - Visual Basic (original) (raw)
The data type of a programming element refers to what kind of data it can hold and how it stores that data. Data types apply to all values that can be stored in computer memory or participate in the evaluation of an expression. Every variable, literal, constant, enumeration, property, procedure parameter, procedure argument, and procedure return value has a data type.
Declared Data Types
You define a programming element with a declaration statement, and you specify its data type with the As clause. The following table shows the statements you use to declare various elements.
| Programming element | Data type declaration |
|---|---|
| Variable | In a Dim Statement Dim amount As Double Static yourName As String Public billsPaid As Decimal = 0 |
| Literal | With a literal type character; see "Literal Type Characters" in Type Characters Dim searchChar As Char = "." C |
| Constant | In a Const Statement Const modulus As Single = 4.17825F |
| Enumeration | In an Enum Statement Public Enum colors |
| Property | In a Property Statement Property region() As String |
| Procedure parameter | In a Sub Statement, Function Statement, or Operator Statement Sub addSale(ByVal amount As Double) |
| Procedure argument | In the calling code; each argument is a programming element that has already been declared, or an expression containing declared elements subString = Left( inputString , 5 ) |
| Procedure return value | In a Function Statement or Operator Statement Function convert(ByVal b As Byte) As String |
For a list of Visual Basic data types, see Data Types.