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As per my V5R3 RPGLE Reference Maunual, under "Arithmetic Operations":
***********
In general, arithmetic operations are performed using the packed-decimal
format. This means that the fields are first converted to packed-decimal
format prior to performing the arithmetic operation, and then converted
back to their specified format (if necessary) prior to placing the result
in the result field.
However, note the following exceptions:
– If all operands are unsigned, the operation will use unsigned arithmetic.
– If all are integer, or integer and unsigned, then the operation will use
integer arithmetic.
– If any operands are float, then the remaining operands are converted to
float.
***********
%SUDBT returns an unsigned numeric value, so, in your code, if the result
is negative, it should give an error... (I hope that the = after the IF
must be a typo...)
Best Regards,
Luis Rodriguez
IBM Certified Systems Expert — eServer i5 iSeries
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