In the next exercise you will examine the various event and alternatives for a single control. To add to this concept, more than one event can be associated with a single control, as with a form. Remember that a control will do nothing to an event-oriented environment unless an event procedure is attached to it. Understanding the relationship of VB to WindowsĪdding a control to a form and setting the control properties set the scene for adding a procedure.Once you understand this syntax, you will be able to understand the syntax designed for all methods. The syntax used for the Print method itself is quite complex and deserves special attention. That, in turn, is followed by a space, so that the following instruction would be in error: The following statement features a period (.) to separate the object from the action to be taken: A method differs from a statement, such as an assignment statement, by specifying the behavior of an object. The single method used in Exercise 3.2 was the Print method. For the time being all procedures you write will use the Private keyword. The meaning and use of the Private keyword, as well as other keywords that can be used in procedure declarations, are discussed in detail under "Defining the Scope of Variables and Procedures," when you consider the topic of variable and module scope. This keyword makes the procedure accessible only in the form module in which it is declared. The Private KeywordĪll control procedures are preceded by the Private keyword by default. A correct remark statement will, by default, be shown in green.
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When writing remarks, use the color code returned by the editor to determine whether your statements are correct or incorrect. Print 'This instruction displays a blank line This enables us to place remarks to the right of an instruction, as in the following example: In writing the procedures, we used the apostrophe rather than Rem. Use the apostrophe (') which is the same as single quotation mark and shares the quotation mark (") key, and not the grave accent (`), which can be found on the tilde (~) key. Also, be careful when writing the statement. Use remark statements to document how your code works and to provide other type of important coding information. Remarks or comments are used to describe the purpose of a procedure as well as key features of a procedure. Rem The Print command is used to display a message In Visual Basic, any statement that begins with a single quotation mark (') or the keyword Rem is a remark, as follows: Message = Welcome to Visual Basic The Remark Statement If you write the following, omitting the quotation marks, you will be in error: In general, use a dollar sign to help distinguish a string variable from another type.Ī string expression must begin and end with quotation marks. The dollar sign ($) is also optional, you could have written the following:īecause the dollar sign ($) is optional, you could have written the following, for message has been declared as a variable of type String: The syntax states that the keyword Let is optional. The syntax for the assignment statement is as follows: The value expression on the right side is assigned to the variable on the left. With an assignment statement, an equation is used. If you make a mistake, as in the following code in which the word String is misspelled, the blue markings will not appear:ĭim message As Sting The Assignment Statement This tells you that the syntax used in writing the statement is correct. If your statement is correct, the word Dim and the words As String appear in blue. When typing statements, observe that the Visual Basic editor changes keywords to blue.
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As a string, it can contain characters, including blank spaces and punctuation, as well as numbers. It declares the variable message as a string of characters. The statement begins with the keyword Dim, as in: The Dim statement is used to declare variables and to allocate storage space. You also added a remark or comment to your code and used the Private keyword. In the preceding procedure, you wrote several coded instructions, which introduced two different programming statements and a method: the Dim statement, an assignment statement, and the Print method.