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<< Click to Display Table of Contents >> Navigation: ThinBASIC Core Language > Data types and variables > BEGIN > BEGIN CONST ... END CONST |
Description
Define beginning and end of a constant declaration block.
It can be used to define a series of constants (equates) with some advantages like automatic increment of numeric values.
Syntax
BEGIN CONST [, InitialNumericValue]
%NumericEquate [= Numeric Expression]
...
$StringEquate = String Expression
END CONST
Returns
None
Parameters
Remarks
Numeric equate name must start with % sign.
String equate must start with $ sign
If numeric equate value is not specified, the last value used incremented by 1 will be assigned.
Restrictions
For string equate it is mandatory to specify the = sign followed by a string expression because it has no sense to assign a blank value.
In any case a string expression resulting in an empty string is accepted.
See also
Examples
Begin Const '---Start of BEGIN CONST block
%a = 1 '---A value was specified so new auto increment will start from 1 + 1
%b '---No value specified. The last value (1) incremented by 1 will be used
%c = 100 '---A value was specified so new auto increment will start from 100 + 1
%d '---No value specified. The last value (100) incremented by 1 will be used
%e, %f '---Use comma to specify multiple consts
$s1 = "Any text" '---For string equates an assignment clause is mandatory
%f1 = 123.456 As EXT '---A value was specified and also forced an EXT type
End Const '---End of BEGIN CONST block
MSGBOX 0, "Values: " & $crlf & _
%a & $crlf & _ '---1
%b & $crlf & _ '---2
%c & $crlf & _ '---100
%d & $crlf & _ '---101
$s1 & $crlf & _ '---AnyText
%f1 & $crlf & _ '---123.456
""
'---See also BEGIN CONTROLID
Begin Const, %WM_USER '---Start of BEGIN CONST block with starting value = %WM_USER
%idButton1
%idButton2
%idTextBox1
End Const '---End of BEGIN CONST block