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Syntax: DEFDBL firstletters
- The first letters can be from A-Z or any other range.
- You can also use commas for specific undefined variable first letters.
- Variables DIMensioned as another variable type or that use type suffixes are not defined otherwise.
- Qbasic's IDE may add DEFDBL before any new SUB or Function also(you can change or remove them if needed).
Example: DEFDBL A, F, H