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comp3-packed-decimal

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Reference for COBOL COMP-3 (packed decimal / BCD) numeric storage -- layout on disk, declaring it in the FD, and pitfalls when carrying the decoded value through working storage and into later arithmetic. Useful when an input record holds a balance, rate, or carry-forward as packed decimal rather than a printable digit string.

When to use

• COBOL COMP-3 numeric storage
• packed decimal layout on disk
• declaring COMP-3 in FD
• carrying decoded values through working storage
• handling balance or rate fields as packed decimal

When not to use

• printable digit string handling

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