As title. My question is not just "it is a language construct", but "WHY". What's the benefit of doing so?

Thanks.
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IIRC, 1/0 defined as constant defines Infinity.

Don't know about LN

Marc

Xiangrong Fang wrote

As title. My question is not just "it is a language construct", but "WHY". What's the benefit of doing so?

I already wrote this in the other thread: if you write "ln(0)" then the compiler will hardcode this as "NaN". I don't know what will happen with "ln(x)" with "x := 0" though. Maybe you'll need to set the exception mask correctly (see here:
http://www.freepascal.org/docs-html/rtl/math/setexceptionmask.html ) to get an exception.

Regards,
Sven

X := 0; Ln(X) seems to generated an exception without need to adjust exception mask. The reason I ask is that I get a strange crash while doing my charting program, I just suspected the reason being an exception is slipped through without being caught.

As this happened outside of IDE, I don't know the exact reason. I will do a screenshot and ask again.

Thanks.

2013/3/5 Sven Barth

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