What Is Data Type in Visual Basic?


Larry Thompson

What Is Data Type in Visual Basic?

Data types are an essential concept in programming languages like Visual Basic. They define the type of data that can be stored in a variable or used as a parameter for a function or subroutine. Understanding data types is crucial for writing efficient and error-free code.

Basic Data Types

Visual Basic provides several basic data types:

  • Integer: Used to store whole numbers, both positive and negative.
  • Long: Similar to the Integer type but capable of storing larger numbers.
  • Single: Used to store single-precision floating-point numbers.
  • Double: Similar to the Single type but capable of storing double-precision floating-point numbers.
  • Date: Used to store dates and times.
  • String: Used to store text or a combination of characters.
  • Boolean: Used to store Boolean values, either true or false.

User-Defined Data Types

In addition to basic data types, Visual Basic allows you to define your own custom data types using the Type..End Type statement. These user-defined data types are useful when you want to group related variables together. For example, you could create a custom data type called ContactInfo, which includes fields like name, email, and phone number.

Syntax for Creating User-Defined Data Types

The syntax for creating a user-defined data type is as follows:

Type ContactInfo
    Name As String
    Email As String
    PhoneNumber As String
End Type

Once you have defined a user-defined data type, you can declare variables of that type and access their fields using dot notation. For example:

Dim person As ContactInfo

person.Name = "John Doe"
person.Email = "john.doe@example.com"
person.PhoneNumber = "123-456-7890"

Casting and Conversion of Data Types

Sometimes, it is necessary to convert data from one type to another. Visual Basic provides various functions and operators for casting and conversion.


Casting involves converting a value of one data type to another compatible data type. For example, you can cast an Integer to a Double if you need to perform arithmetic operations with more precision.

Dim num1 As Integer
Dim num2 As Double

num1 = 5
num2 = CDbl(num1)


Conversion involves changing the representation of data from one format to another. Visual Basic provides functions like CInt(), CStr(), and CDate(), which allow you to convert values between different data types.

Dim strNum As String
Dim intNum As Integer

strNum = "10"
intNum = CInt(strNum)


Data types play a crucial role in Visual Basic programming. By understanding and utilizing the appropriate data types, you can ensure the accuracy, efficiency, and integrity of your code. Whether you are working with basic data types or creating custom data types, Visual Basic provides a wide range of options to suit your needs.

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