DEFINE

_DEFINE lets you define a range of variables according to their first character as a datatype.

Syntax: _DEFINE range or letter[, range2 or letter2[, range3 or letter3[, ...]]] AS [ _UNSIGNED ] datatype

• Range is in the form firstletter-endingletter (like A-C) or just define a single letter as a datatype.
• Datatypes: INTEGER, SINGLE, DOUBLE, LONG, STRING, _BIT, _BYTE, _INTEGER64, _FLOAT
• Can also use the prefix _UNSIGNED for positive numerical values only.

Example 1:

_DEFINE A-C, F AS _UNSIGNED INTEGER

Explanation: Variables that start with the letters A, B, C or F will now be defined as unsigned integers. Unsigned integers can only use positive values while ordinary integers can also use negative values.

Example 2: How negative assignments affect the _UNSIGNED value return of a byte(8 bits).

00000001 - unsigned & signed are both 1

01111111 - unsigned & signed are both 127

11111111 - unsigned is 255 but signed is -1

11111110 - unsigned is 254 but signed is -2

11111101 - unsigned is 253 but signed is -3

See also: DIM, DEFSTR, DEFLNG, DEFINT, DEFSNG, DEFDBL, _UNSIGNED, ABS, SGN

Referance: Mathematical Operations

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