Computer Programming Concepts and Visual Basic David I. Schneider

34 Computer Programming Concepts and Visual Basic
button. After you click on Debug, the line containing the offending word will
be highlighted.
7. At design time, colors are selected from a palette. At run time, the eight most
common colors can be assigned with the color constants vbBlack, vbRed,
vbGreen, vbYellow, vbBlue, vbMagenta, vbCyan, and vbWhite. For instance,
the statement
picBox.BackColor = vbYellow
gives picBox a yellow background.
8. For statements of the form object.property = setting, with properties Caption,
Text, or Font.Name, the setting must be surrounded by quotes. (For instance,
lblTwo.Caption = “Name”, txtBox.Text = “Fore”, and picBox.Font.Name =
“Courier”.) When the words True or False appear to the right of the equal sign,
they should not be surrounded by quotation marks.
9. Code windows have many features of word processors. For instance, the operations
cut, copy, paste, find, undo, and redo can be carried out with the sixth
through eleventh icons of the Toolbar. These operations, and several others, also
can be initiated from the Edit menu.
10. Names of existing event procedures associated with an object are not automatically
changed when you rename the object. You must change them yourself and
also must change any references to the object. Therefore, you should finalize
the names of your objects before you put any code into their event procedures.
11. If you find the automatic List Properties/Methods feature distracting, you can
turn it off by pressing Tools/Options, selecting the Editor page, and clicking on
Auto List Members. If you do so, you can still display a list manually at the
appropriate time by pressing Ctrl+J.
12. Earlier versions of Visual Basic used the property FontSize instead of
Font.Size. Although Font.Size is preferred, FontSize is allowed for compatibility.
Similarly, properties such as FontBold, FontItalic, and FontName have been
included for compatibility with earlier versions of Visual Basic.
13. Assignment statements can be written preceded with the keyword Let. For
instance, txtBox.Text = “Hello” also can be written Let txtBox.Text =
“Hello”. Therefore, assignment statements are also known as Let statements.
2.3 NUMBERS
Much of the data processed by computers consists of numbers. In “computerese,” numbers are
often called numeric constants. This section discusses the operations that are performed with
numbers and the ways numbers are displayed.