Keyword
CType
Description
Performs explicit type conversion (only for data types that can be implicitly converted).
Usage
result = CType(value, datatype)
Name |
Type |
Description |
---|---|---|
result |
Any |
The passed Value converted to the datatype. |
value |
Any |
The value to be converted to datatype. This must be a value that can be implicitly converted to datatype. |
datatype |
DataType |
A built-in datatype. This must be a datatype to which value can be implicitly converted. |
Notes
The CType operator is the explicit version of type conversion. Implicit conversion is available via the assignment (>=) operator.
CType does not necessarily preserve the value across the types. It converts the passed value source type to the destination data type. In that regard, it is identical to implicit conversion. If you are using CType to convert a real number data type (e.g., single, double, currency) to an integer data type, it truncates the value rather than rounds. Sign extension is preserved when converting from a signed data type to another signed data type. Conversion between signed and unsigned types (either way) preserves the bits but not the value.
Sample code
The following compares implicit and explicit type conversion:
Var s As Single
Var i As Integer
i = 5
s = i ' implicit conversion
s = CType(i, Single) ' explicit conversion
The following illustrates loss of information in the conversion:
Var d As Double
Var i As Integer
d = 566.75
i = CType(d, Integer) ' i = 566
i = d ' i = 566
Convert an Integer to Boolean:
' Convert Integer to Boolean
' 0 converts to False
' non-zero converts to True
Var i As Integer = 42
Var b As Boolean
b = CType(i, Boolean)
Compatibility
All project types on all supported operating systems.
See also
>= operator.