Declares constants for use in place of literal values.
[Public | Private] Const constname = expression
The Const statement syntax has these parts:
| Part | Description |
|---|---|
| Public | Optional. Keyword used at module level to declare constants that are available to all procedures in all modules. Not allowed in procedures. |
| Private | Optional. Keyword used at module level to declare constants that are available only within the module where the declaration is made. Not allowed in procedures. |
| constname | Required. Name of the constant; follows standard variable naming conventions. |
| expression | Required. Literal or other constant, or any combination that includes all arithmetic or logical operators except Is. |
Constants are public by default. Within procedures, constants are always private; their visibility can't be changed. Within a module, the default visibility of a module -level constant can be changed using the Private keyword.
To combine several constant declarations on the same line, separate each constant assignment with a comma. When constant declarations are combined in this way, the Public or Private keyword, if used, applies to all of them.
You can't use variables, user-defined functions, or intrinsic Visual Basic for Windows CE run-time functions (such as Chr) in constant declarations. By definition, they can't be constants. You also can't create a constant from any expression that involves an operator, that is, only simple constants are allowed. Constants declared in a Sub or Function procedure are local to that procedure. A constant declared outside a procedure is defined throughout the module in which it is declared. You can use constants anywhere you can use an expression.
Note Constants can make your code self-documenting and easy to modify. Unlike variables, constants can't be inadvertently changed while your program is running.