thinBasic allows you to refer to numeric constants by name. Those constant values are called equates.
A numeric equate (constant) must start with % sign.
Equates data type
Equates declaration has the following syntax:
%EquateName = NumericExpression [As NumericDataType]
Equal sign is optional, so the above sentence can also be written as:
%EquateName NumericExpression [As NumericDataType]
Where the optional parameter NumericDataType can be any of the allowed numeric data types: BYTE, INTEGER, WORD, DWORD, LONG, QUAD, SINGLE, DOUBLE, EXTENDED, CURRENCY.
If not NumericDataType is specified, default type will be assumed to be LONG.
Binary and hex numbers can be represented indicating &B or &H followed by the relative representation. Examples:
%MAXIMUM_D = &HFFFFFFFF As DWord
%MAXIMUM_L = &H7FFFFFFF As Long
%MINIMUM_L = &H80000000 As Long
%Normal = &B000000
%ReadOnly = &B000001
%Hidden = &B000010
%System = &B000100
%vLabel = &B001000
%SubDir = &B010000
%Archive = &B100000
Hex numbers can be also represented using C notation 0x... followed by the hex representation of the hex value.
%MAXIMUM_D = 0XFFFFFFFF As DWord
%MAXIMUM_L = 0X7FFFFFFF As Long
%MINIMUM_L = 0X80000000 As Long
Some equate declaration example:
%MAXPIECES = 32
%NPARAM = 3
%NTYPE = 1
%RANK = 2
%FILE = 3
%KING = 1
%PAWN = 2
%MAXVALUE = 0.999 AS EXT
%ANYVALUE = 0.999 AS DOUBLE
1.Numeric equates name must start with percent sign %
2.Unlike variables, you can use an equate on the left side of an assignment statement only once.
3.If an equate has already been created, subsequent attempts to assign a new value will fail but no error will be generated