Sure, all things are possible. It is _possible_ to write perfect code, it's just not very likely. However, under commercial conditions it is so unlikely as to b

Sure, all things are possible. It is _possible_ to write perfect code, it's just not very likely. However, under commercial conditions it is so unlikely as to be implausible; you just won't have the time or budget for it. NASA can do it, most of the time, but the difference is that they take the time to find all of the bugs, not that they can write the code perfectly the first time through.