Jens,

In another life, I was very involved in developing math & statistics programs & I am very familar with these types of issues but it seems to me kixtart is particularly sensitive to this issue. Your test examples seem to be encountering problems somewhere in the 5th through 7th digit range. This is less accuracy than the old IBM mainframe word of 4 bytes.

I didn't think of the break command. Silly me for not thinking of such an obvious issue. I found this game a bit frustrating because validation was such a painful process. This weekend was do the family income taxes time. I tried to run validation several times but each time, I found that I had to stop it to work on something else.
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Jack