Some examples of valid (but not very descriptive) Visual Basic variable names: Variable names in Visual Basic are made up of letters (upper and lowerĬase) and digits. Operators and then assigns either True or False to anumber depending on the values of anothernumber and Instead it treats all but the first = signs as equality test You can also declare multiple variables with one statement:Īnumber = anothernumber = yetanothernumber = 3

Here is an example of declaring an integer, which we've called some_number. A Variant variable is one that can hold data of any type.ĭeclaration of Variables If you don't specify the type then the compiler will use Variant.

the compiler can sometimes check that you have used the correct type.Īll variables in Visual Basic are typed, even those declared as Variant.

you get the datatype you want instead of Variant,.

For any but the simplest programs it is better to declare all variables. In Visual Basic variables can be declared before using them or the programmer can let the compiler allocate space for them. So, if you have a variable i that is initialized to 4, i+1 will equal 5. You can think of a variable as being equivalent to its value. It often helps to think of variables as a 'pigeonhole', or a placeholder for a value. Variables are most simply described as names by which we refer to some location in memory - a location that holds a value with which we are working. Like most programming languages, Visual Basic is able to use and process named variables and their contents. These compound statements include other statements and expressions. There are other more complex statements which can span several lines In such cases he or she will call the function as though it were a subroutine, however only the first form above can be used. Sometimes the programmer wants to call a function but is not interested in the return value only in the side-effects.

If you use thisįorm you must enclose the entire argument list in a parenthesis. The keywordĬall is a leftover from older versions of Basic. X is a subroutine which takes two string arguments. X 'Hello', 'World' Call x ( 'Hello', 'World' )

Visual basic is