Microsoft Windows Calculator Error

www.bustatech.com/
Try this on your PC, open your Windows Calculator, and perform these calculation:
Get the Square Root of 4, and the answer should be 2. Now from the answer, 2 - 2, and you will get an unexpectable answer.

[@fernozzle]

That's -0.00000000000000000000000000000000000000081648465955514287168521180122928. (39 zeros)
Considering that a square root function can never be perfect, I think that that's an acceptable margin of error for most cases.

[@CompactStar]

That "e" means 0.0000....0001 where the number of zeroes is the number after the e, so the number it outputted (e-19) is really just a "0.0000000000000000001", which means it a precision error.

[@fernozzle]

RUclips probably should not be hyphenating numbers.

[@qgali2804]

am i only the subscriber of you that saw this comment?

[@wwechess]

the calculator is right
it interpreted the expression as
sqrt9 -3 as a radical ,not bedmass
therefore its gives you that answer :D

[@Theledart]

Most calculators are smart enough to know that sqrt(4) is 2, etc. Try doing the same with the calculator on Mac OS. It gives the correct answer 0.

[@RonaldMoD]

Yes but the interesting thing is that the answer is not the same. The only difference between the two is that his is Windows 7, mine is Windows Vista. My processor is Intel. Maybe his is AMD?

[@RonaldMoD]

I tried this om my Vista 32 bit. The result was (sqr 4 - 2) -8,1648465955514287168521180122928e-39