Hi Graham,
If I execute (-8)^(2/3) in LiveCode 6.6.1, I get "execution error at
line 7 (pow: range error (overflow)), char 17", i.e. an execution error
instead of NaN.
--
Best regards,
Mark Schonewille
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On 6/24/2014 20:02, Graham Samuel wrote:
Hi
I have a bit of code that looks for input errors where the user is supposed to
write an arithmetic expression into a field. The relevant fragment looks like
this
try
put value(fld "myField") into testResult
catch
answer "oops, that's not a valid real number. Try again"
exit mouseUp
end try
...
Now I input a legitimate expression like 3+sin(pi/2)
the catch doesn't fire, as expected. If I put in something which isn't a
well-formed expression, like
ardvaark + 92
it does fire, as expected. If I put
sqrt(-1)
that fires too. But if I put
(-8)^(2/3)
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?
TIA
Graham
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