> 1) What is the purpose of the X preceding the numeric parameters?

X defines that the following string should be interpretated as hex value

> 2) Why is there an F at the end of your second numeric parameter?

The CL numerics are packed values, i.e. each zone of a byte is a digit (while
zoned numerics uses a whole byte for a digit).

F is the sign (+) other valid values for the sign are C and D

Well, this is some of the *very* basic knowledge a programmer should know 
because
it is essential for understanding -for instance- pgm behaviour, pgm testing,
understanding and solving problems. - But unfortunately i cannot remember if
there is an IBM book where it is described (i learned it many years ago during
learning programming - regardless of AS/400).

Perhaps other readers can give you some hints.

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