problem with string conversion to double

[Eric Klumpp]

Hi everybody,

I have a problem to convert a string containing an integer value to a 
double format.

My string, called txt, contain "0" or "1", and in both cases I do : 
sscanf(txt,"%lf",&num) where num is a double. In both cases, num contain 
"-NaN" and the sscanf return 1.
I have tried to replace "%lf" by a lot of other flag (%f, %g, %e, %lf, 
%lg, %Lf, %Lg) but the result is the same. And same result by : 
num=strtod(txt,NULL)

The only one solution I have found is to do : num=atof(txt)

Can someone explain me why the result is -NaN (-infinity) ?
And in the same time, has anybody a solution to convert long double to 
string, and string to long double ?

Eric

PS : I use a string format in a database in order to backup and 
manipulate all possible format. So doing I have a lot of conversions 
between string and other types and in both way.


-- 
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Eric Klumpp
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email : eric.klumpp at emailforever.com         / ^   - \
        eric.klumpp at freesbee.fr             ( (o) (o) )        
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