void Integer::NaN(string s)
{
   if(s == NULL)
   {
      if(!isdigit)
      {
         this->nan = true;
         return;
      }
      this->nan = false;
   }

}

}


void Integer::NaN(string s)
{
   string::iterator p;
   for(p = s.begin(); p < s.end(); p++)
   {
      if(!isdigit(*p))
      {
         this->nan = true;
         return;
      }
   }
   this->nan = false;
}

}