In this format, the digit bits in the rightmost byte hold the sign of the number and the zone bits in that byte hold the rightmost digit in the number.

All other bytes hold two digits each. As a result, each packed-decimal number has an odd number of digits and a sign.

Packed-decimal format (Packed-Decimal or Comp-3 usage)

00 12 3C Positive number with a value of +123

00 12 3D Negative number with a value of -123

Format :

This format is most efficient when you code an odd number of
digits in the PICTURE description, so that the leftmost byte is fully used.
Packed-decimal items are handled as fixed-point numbers for arithmetic purposes.

Example :

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