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Language Keyword

Performs explicit type conversion (only for data types that can be implicitly converted).


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.


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:

Dim s As Single
Dim i As Integer

i = 5
s = i // implicit conversion
s = CType(i, Single) // explicit conversion

The following illustrates loss of information in the conversion:

Dim d As Double
Dim i As Integer

d = 566.75
i = CType(d, Integer) // i = 566
i = d // i = 567

Convert an Integer to Boolean:

// Convert Integer to Boolean
// 0 converts to False
// non-zero converts to True
Dim i As Integer = 42

Dim b As Boolean
b = CType(i, Boolean)

See Also

= operator.