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>What is "matherr"? I can't find anything about this in the ISO standard
>draft, system manpages or K&R.

I'm sorry. I learned about "matherr" back in my DOS days, and I assumed that
"matherr" was ANSI C, but it's not.  Harbison and Steele say that "matherr"
comes from System V Unix. Turbo C, Watcom C and Microsoft C all had "matherr".

Anyway, "matherr" does not handle division by zero and so all this is moot.
Sorry about the noise.