🚀 go-pugleaf

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()
{
   DoLogFunction(0);  //SING ERROR
   DoLogFunction(-1); //DOMAIN ERROR
}


Try/Catch around the 'DoLogFunction()' function call or even around the 
log10 call doesn't work.

Of course I can test val to see if it's negative and non-zero.  The 
problem is, I think I have done that in the following code:

double DoLogFunction(const double &val)
{
   double result = 0;
   if (val>0)
   {
      try
      {
         result = log10(val);
      }
      catch (...)
      {
        ;//do nothing, result is already 0
      }
   }
   return result;
}

However, occasionally I still get the error which results in a Windows 
dialog box appearing indicating the error.

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

thanks in advance