clipper automatic Interview Questions and Answers

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Clipper Automatic Interview Questions and Answers

  1. What is Clipper Automatic?

    • Answer: Clipper Automatic refers to applications built using the Clipper programming language, often characterized by their database-driven nature and use of dBASE-compatible files. These applications were popular for business applications in the 1980s and 90s and some remain in use today.

  2. What are the key features of Clipper?

    • Answer: Key features include its xBase compatibility, strong support for procedural programming, efficient database handling, and the ability to create standalone executables.

  3. How does Clipper handle database interactions?

    • Answer: Clipper uses its own database engine or can interact with various xBase-compatible databases like dBASE, allowing for efficient data retrieval, manipulation, and storage.

  4. Explain the concept of memo fields in Clipper.

    • Answer: Memo fields are used to store large text data, often exceeding the character limits of regular fields. They usually point to separate files where the text is stored.

  5. What are some common Clipper data types?

    • Answer: Common data types include CHARACTER, NUMERIC, LOGICAL, DATE, and MEMO.

  6. Describe the use of indexes in Clipper databases.

    • Answer: Indexes are used to speed up data retrieval by creating sorted pointers to records, allowing for quick lookups based on specific field values.

  7. How are relationships between tables managed in Clipper?

    • Answer: Relationships are typically managed through shared key fields, often requiring explicit JOIN operations in queries to link related data from multiple tables.

  8. Explain the role of the SET commands in Clipper.

    • Answer: SET commands configure various aspects of the Clipper environment, including database settings, screen handling, and system parameters.

  9. What are some common Clipper functions for string manipulation?

    • Answer: Examples include SUBSTR(), TRIM(), UPPER(), LOWER(), and many others.

  10. How does Clipper handle error handling?

    • Answer: Clipper typically uses ON ERROR routines to trap and handle errors gracefully, preventing program crashes and providing informative messages.

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