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My Desire calculator calculates incorrect

Discussion in 'Android Apps & Games' started by Harry2, Oct 31, 2010.

  1. Harry2

    Harry2 Extreme Android User
    Thread Starter


    I search a better calculator for my Desire.

    The stock calculator calculates incorrect,
    e.g. 100-99.9=0.0999999999

    The new calculator should very easy to use (and calculate correctly).
    Mathematical functions to show graphically would be nice :)

    With these many, many calculators in the market it is hard to find the right.


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  2. Chilly McFreeze

    Chilly McFreeze Well-Known Member

    RealCalc is my favorite, because it looks (and functions) exactly like the scientific calculator I used at school!
    Harry2 likes this.
  3. Szadzik

    Szadzik Extreme Android User

    I have always used Retro Calculator.
    Harry2 likes this.
  4. Crumm

    Crumm Member

    Calculator by Stormin Dormin works good.
    Harry2 likes this.
  5. Sloper59

    Sloper59 Lurker

    Strange. I just tried that calculation on my Desire HD and it gave the same result! What's happening there?
  6. JimSmith94

    JimSmith94 Android Enthusiast

    Same result on my Sprint Evo!
  7. Harry2

    Harry2 Extreme Android User
    Thread Starter

    Thanks, the proposed calculators of yours calculates properly! :)

    So it is a bug in the HTC calculator?

  8. KlaymenDK

    KlaymenDK Android Expert

    This is most likely because the calculator isn't using enough internal precision (that is, the right type of variable for floating-point math; possibly a float where a double should have been used).

    The thing is, computers love numbers but inherently suck at decimals. :eek:
    You know how you can express "1/2" quite perfectly as "0.5", but for "1/3" you get the problem that "0.33333..." is never going to be entirely accurate? The same thing happens in binary, only on different occasions.

    So when you hit one of those occasions, you will see a precision error in the form of a number that is "ever so slightly" smaller or larger than you'd expect.

    Wikipedia: Representing_fractions_in_binary gives the following example.
    Harry2 likes this.

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