_DEFINE lets you define a range of variables according to their first character as a 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.
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 returned by 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
Referance: Mathematical Operations