Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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                           ┌────────────┐
                           │ Data Types │
                           └─────┬──────┘
            ┌────────────────────┼────────────────────┐
      ┌─────┴─────┐          ┌───┴────┐         ┌─────┴──────┐
      │ Reference │          │ Simple │         │ Structured │
      └─────┬─────┘          └───┬────┘         └─────┬──────┘
      ┌─────┴─────┐ ┌────────┬───┴─────┬──────┐   ┌───┴────┐
      │ Pointer   │ │ String │ Ordinal │ Real │   │ ARRAY  │
      ├───────────┤ └────────┴───┬─────┴──────┘   ├────────┤
      │ Procedure │   ┌──────────┼──────────┐     │ FILE   │
      └───────────┘   │ Boolean  │ Integer  │     ├────────┤
                      ├──────────┼──────────┤     │ RECORD │
                      │ Char     │ Subrange │     ├────────┤
                      ├──────────┴──────────┤     │ SET    │
                      │     Enumerated      │     ├────────┤
                      └─────────────────────┘     │ Class  │
                                                  └────────┘