The Long-Running Windows Calculator Bug @mausolfb
The Long-Running Windows Calculator Bug  @mausolfb
Uploaded December 2023 | Updated September 2026, 1 hour ago
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. For a long time the Windows calculator that's standard on all versions of Microsoft Windows had an issue with square roots... If you took a number with a perfect square such as four and subtracted two from the result you'd expect to get zero. However that isn't what happens; instead you get an odd result no where near zero! This was determined to be a result of the arbitrary precision arithmetic library the calculator uses. In patch 17639 for Windows 10 this issue was finally addressed and patched.

There was a counter-argument made about the bug in that it wasn't a bug at all but in fact a misuse/understanding of the calculator. In it, when you take the square root of a number the calculator performs the calculation and then the result is stored (and displayed) temporarily and by inputting the next function (like subtraction) and then hitting the equals button you'll get the correct zero answer.

So just how far back did this bug go?
#windows #calculator #bug
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The Long-Running Windows Calculator Bug

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