Hi Toshikazu
Thanks so much for your help. You have introduced the case for the c format fixed decimal...Second document says that its Oracle issue is solved since 7.0 build 001. I imagine it is referred to the involved cast from Oracle to Plex, but I suppose casting a character to a fixed decimal continues giving a NAN...
Certainly, with the advent of Plex 7.2.1 my issue becomes irrelevant, because I can use at this level c++ isnan routine.
Actually my question here was related to fine tune our compiling process, in order to apply the /fp:precise parameter to the compiler as reccomended in MSDN.
By the way, staying yet at VS 2005 level, we replaced our proposed test for NAN, with a detailed and ruled scan of a string, which works.
Jorge Ubeda