The buggy iOS 11 has provided Apple fanboys with wonderful features like terrible battery life, app crashes and screen freezes, but now it seems that there is a calculator bug.

The calculator app has a weird problem that causes simple operations to go completely wrong, and it appears to be because of the stupid button animations implemented by Apple.

If you are unfortunate enough to be using iOS 11, you can replicate the bug by opening the calculator app and type quickly 1 + 2 + 3. The result should be either 23 or 24, depending on how it’s being replicated on your device.

The bug is related to the animation of the four numeric operators and it does not apply to digits. While some experienced devs said on Reddit that this animation is too long and isn’t stopped by pressing a digit, so the calculator ignores some taps. Others believe the animation just gets stuck after clicking an operator.

In other words, in the name of super-cool design, Apple programmers borked one of the most simple computer functions on a phone.

The Tame Apple Press says that there is nothing to worry about as this particular bug will not affect the performance of your phone. However, you should not use the calculator if you want to be certain that it will add up numbers. Seems fair enough – spend $1,000 on a phone which is too stupid to add up your shopping list.

What is clear is that for all the money Apple expects its fanboys to spend on its shiny toys, it is not being spent on doing a basic QA.

Apple is famous for being unable to write programs that many students have to write in high school. Its best effort included clock software which could not handle a daylight savings change or self-update when it crossed a time zone. Clearly Apple developers never had Dr Bins for a computer studies teacher in sixth form – they would be able to write such code in Basic or Pascal or be too terrified to come to work.