Comment on IEEE 754

• tdawg@lemmy.world ⁨2⁩ ⁨weeks⁩ ago

  Please tell me you aren’t using floating points with money

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  • wewbull@feddit.uk ⁨2⁩ ⁨weeks⁩ ago

    Knowing not to use floating point with money is good use of that knowledge.

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  • psivchaz@reddthat.com ⁨2⁩ ⁨weeks⁩ ago

    You’d be dismayed to find out how often I’ve seen people do that.

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  • zqwzzle@lemmy.ca ⁨2⁩ ⁨weeks⁩ ago

    Yeah I shudder when I see floats and currency.

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    • Womble@lemmy.world ⁨2⁩ ⁨weeks⁩ ago

      Eh, if you use doubles and you add 0.000314 (just over 0.03 cents) to ten billion dollars you have an error of 1/1000 of a cent, and thats a deliberately perverse transaction. Its not ideal but its not the waiting disaster that using single precision is.

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    • SubArcticTundra@lemmy.ml ⁨2⁩ ⁨weeks⁩ ago

      That sounds like an accident waiting to happen

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  • Saleh@feddit.org ⁨2⁩ ⁨weeks⁩ ago

    How do you do money? Especially with stuff like some prices having three or four decimals

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    • jmcs@discuss.tchncs.de ⁨2⁩ ⁨weeks⁩ ago

      Instead of representing $1.102 as 1.102 your store it as 1012 (or whatever precision you need) and divide by 1000 only for displaying it.

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      • Saleh@feddit.org ⁨2⁩ ⁨weeks⁩ ago

        So if you handle different precisions you also need to store the precision/exponent explicitly for every value. Or would you sanitise this at input and throw an exception if someone wants more precision than the program is made for?

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• cyborganism@lemmy.ca ⁨2⁩ ⁨weeks⁩ ago

  No. I don’t have to remember that.

  I just have to remember the limits and how you can break the system. You don’t have to think about the representation.

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