Re: log10: SING Error -> Try/Catch??

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#2166

From: Thomas Maeder [TeamB]
Date: Wed, 18 Apr 2007 19:22

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Dan <Dan@do.not.spam> writes:

> log10 functions where the value passed to the function is negative
> results in a "LOG10: DOMAIN error" if the value is 0 then it's a
> "LOG10: SING error" For example the following code will create a
> DOMAIN error.
>
>
> #include <math.h>
>
> double DoLogFunction(const double &val)
> {
>    return log10(val);
> }
>
> void main()

The return type of main() has to be int.

> {
>    DoLogFunction(0);  //SING ERROR
>    DoLogFunction(-1); //DOMAIN ERROR
> }
>
>
> Try/Catch around the 'DoLogFunction()' function call or even around
> the log10 call doesn't work.

Because what the program does is causing undefined behavior, not
throwing exceptions.

> What is the BEST way to do this type of trapping so that I don't get
> the error?

As for most problems, there isn't a uniform best solution.

Have you considered providing your own version of _matherr()?

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Subject: Re: log10: SING Error -> Try/Catch??
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