Some variables don’t change value during the execution of program. These are constants that appear many times in your code. The constants are preferred for two reasons :
• Constants don’t change value
• Constants are processed faster than variables
The general form to declare a constant is as follows :
Const constantname [As type] =value
The As type part of the declaration is optional. If you omit it, the constant’s type is determined by the value you assign to it. Constants also have a scope and can be Public or Private.
e.g. Public Const pi as Double =3.14159265358979
Visual Basic uses constants extensively to define the various arguments of its methods and the settings of the various control properties.
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