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Answer Posted / billyboyo
Packed decimal is IBM's method to allow calculation
directly in base-10.
A DISPLAY numeric field might be PIC S9(7).
If you were to try to add 1 to this, the compiler would
convert, in its own work area, this field to a "packed
decimal" field and generate an AP (Add Packed) to do the
addition, then it would convert the field back to DISPLAY
and the correct value would be in your PIC S9(7) field.
Notice that if you had started off with a COMP-3 (packed
decimal) PIC S9(7) you avoid doing two conversions (from
display to packed and from packed to display).
If you have 1234567 in your display field, it looks like
this in HEX "F1F2F3F4F5F6F7". In comp-3/packed decimal it
looks like this in HEX "1234567C", where the C is the sign
(C is positive, D is negative, and F is unsigned).
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