As I stated previously (maybe in this or another thread) - I don't care how good you are, there are contingencies and configurations that you either forgot, didn't know about, or could not foresee.  The only way to make software that works on every computer where it is run is to distribute it to every person who will run the software at some time or another - which is not a good idea.

For instance (before 'we can write perfect software' is stated): You've used top-notch developers, spent long periods beta-testing, used numerous test beds.  The software is infallible.  Right...  Except for Joe-Bob who has some vague FragYourInfallibleSoftware product installed which, well, conflicts with your software at some point (drivers, resources, naming, file extensions, etc. etc. etc.).  Being that FragYourInfallibleSoftware was written by Mary-Lou in Afghanistan using Windows ME and is run by about three people on the planet - how could you possibly (without diety-like powers) figure this into your development?  Off with the patch.

If a 'one-liner' like "Hello World" isn't infallible, a 'million-liner' is a million times more likely to be so...

Facts of life - humans are imperfect and therefore so is everything associated with them.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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