"nan" v. try-catch for arithmetic

Mark Wieder mwieder at ahsoftware.net
Wed Jun 25 00:56:22 CEST 2014


Graham-

Tuesday, June 24, 2014, 11:02:56 AM, you wrote:

> I get a result, "nan", and the catch doesn't fire. Why not? Maybe
> someone can explain what the engine is doing here - or is it just an
> obscure bug?

It fires for me in either case.
To get the actual error code, change the code to

try
  put value(fld "myField") into testResult
catch e
  answer e
  exit mouseUp
end try

That way you see that sqrt(-1) results in 555 "sqrt: domain error" and
(-8)^(2/3) results in 402 "pow: range error (overflow)". Both of them
also return "-nan", as expected.

-- 
-Mark Wieder
 ahsoftware at gmail.com

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