VBScript Constants
Constant is a named memory location used to hold a value that
CANNOT be changed during the script execution. If a user tries to
change a Constant Value, the Script execution ends up with an error.
Constants are declared the same way the variables are declared.
Declaring Constants
Syntax:
[Public | Private] Const Constant_Name = Value
The Constant can be of type Public or Private. The Use of Public or
Private is Optional. The Public constants are available for all the
scripts and procedures while the Private Constants are available
within the procedure or Class. One can assign any value such as
number, String or Date to the declared Constant.
Example 1:
In this example, the value of pi is 3.4 and it displays the area
of the circle in a message box.
<html>
<body>
<script language="vbscript" type="text/vbscript">
Dim intRadius
intRadius = 20
const pi=3.14
Area = pi*intRadius*intRadius
Msgbox Area
</script>
</body>
</html>
Example 2:
The below example illustrates how to assign a String and Date
Value to a Constant.
<html>
<body>
<script language="vbscript" type="text/vbscript">
Const myString = "VBScript"
Const myDate = #01/01/2050#
Msgbox myString
Msgbox myDate
</script>
</body>
</html>
Example 3:
In the below example, the user tries to change the Constant Value;
hence, it will end up with an Execution Error.
<html>
<body>
<script language="vbscript" type="text/vbscript">
Dim intRadius
intRadius = 20
const pi=3.14
pi = pi*pi 'pi VALUE CANNOT BE CHANGED.THROWS ERROR'
Area = pi*intRadius*intRadius
Msgbox Area
</script>
</body>
</html>
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