Not quite relevant but: I once found a bug in apple's calculator app for the iphone (which I reported and they fixed after 3-4 months) where REALLY basic math o

Not quite relevant but: I once found a bug in apple's calculator app for the iphone (which I reported and they fixed after 3-4 months) where REALLY basic math operations like division gave different answers depending on the way you held the phone. (portrait vs. landscape). I don't just mean the displayed precision changed, I mean the actual answer changed, fairly significantly. In particular, if you accidentally tilted the phone in the wrong direction so that it switched to portrait then tilted it back, you'd get a different answer than if you held the phone steady. I only found this bug while in the middle of a midterm for a graduate-level finance class... Edit: details of one of the bugs: Steps to reproduce: 1. Open the calculator application 2. Ensure the app is held vertically (non-scientific mode) 3. Enter a number such as 10,000,000 4. Attempt to make the number 10,000,000.1 by pressing "." and "1" 5. Notice that instead of this number, the calculator application converts the input to 100,000,001 - i.e. the decimal point was ignored. This does not happen in scientific mode. Bug ID# 6743558.