The existence of a bug that shows "1 + 2 + 3" answer to "24" on the iOS 11 calculator turned out

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iOS 11 Bug: Typing 1 + 2 + 3 Quickly in the Calculator App Will not Get You 6 - Mac Rumors
https://www.macrumors.com/2017/10/24/ios-11-calculator-animation-bug/

This bug isredditBut what was talking about. It is pointed out that when you type a simple calculation of 1 + 2 + 3 at a high speed, you will display the wrong answer "24" with a very high probability. The following movie that I actually tried. If you input the calculation slowly, the answer "6" is displayed properly, but if you drive at a fast speed it will be "24".

The iOS 11 calculator proved to give "1 + 2 + 3 = 24" answer - YouTube


Enter "1 + 2 + 3" slowly and press "=" at the end ... ...


Although it is commonplace, the answer is displayed as "6".


However, if you drive fast with both hands ... ...


The answer is "24"


If you press 'C' to reset and try again, the answer is '24'. Even elementary school first grader has caused a difficult mistake.


The cause of this problem seems to be present in the animation display part of the calculator application. In this application, animation effect which glows brightly and disappears slowly when tapping a button is implemented, but it is designed not to accept the next action until this brightness disappears. Although I can understand by actually trying this application, it is slow to unexpectedly disappear, unexpectedly thinking "as soon as possible". That is, in the above example, the calculation formula that would have input "1 + 2 + 3" is input as "1 + 23" and the answer is "24". In other words, although it may not be "bug" strictly, it seems to be said that it is a bug that is equivalent to a bug in the sense that it will give wrong answers even under normal usage conditions.

A similar problem arises in cases where three or more numbers are used, such as "1 + 5 + 9 = 60", "1 × 2 × 3 = 23", "9 ÷ 3 ÷ 3 = 0.09090909" It seems.