• Killing_Spark@feddit.de
        link
        fedilink
        arrow-up
        18
        ·
        1 year ago

        Only to 2^54. The amount of integers representable by a long is more. But it can and does represent every int value correctly

        • parlaptie@feddit.de
          link
          fedilink
          arrow-up
          5
          arrow-down
          6
          ·
          1 year ago

          *long long, if we’re gonna be taking about C types. A long is commonly limited to 32 bits.

          • Aux@lemmy.world
            link
            fedilink
            arrow-up
            15
            ·
            1 year ago

            C is irrelevant because this post is about Java and in Java long is 64 bits.

          • voxel@sopuli.xyz
            link
            fedilink
            arrow-up
            2
            ·
            edit-2
            1 year ago

            you should never be using these types in c anyway, (u?)int(8/16/32/64)_t are way more sane

      • RoyaltyInTraining@lemmy.world
        link
        fedilink
        arrow-up
        2
        ·
        1 year ago

        A double can represent numbers up to ± 1.79769313486231570x10^308, or roughly 18 with 307 zeroes behind it. You can’t fit that into a long, or even 128 bits. Even though rounding huge doubles is pointless, since only the first dozen digits or so are saved, using any kind of Integer would lead to inconsistencies, and thus potentially bugs.

  • jayrhacker@kbin.social
    link
    fedilink
    arrow-up
    67
    arrow-down
    3
    ·
    1 year ago

    It’s the same in the the standard c library, so Java is being consistent with a real programming language…

      • Glome@feddit.nl
        link
        fedilink
        arrow-up
        5
        ·
        1 year ago

        Java has many abstractions that can be beneficial in certain circumstances. However, it forces a design principle that may not work best in every situation.

        I.e. inheritance can be both unnatural for the programmer to think in, and is not representative of how data is stored and manipulated on a computer.

        • lightsecond@lemmy.world
          link
          fedilink
          English
          arrow-up
          4
          ·
          1 year ago

          We’re gate-keeping the most mainstream programming language now? Next you’ll say English isn’t a real language because it doesn’t have a native verb tense to express hearsay.

        • kaba0@programming.dev
          link
          fedilink
          arrow-up
          1
          ·
          1 year ago

          And it is not forced at all. Noone holds a gun to your head to write extends. “Favor composition over inheritance” has been said as a mantra for at least a decade

        • kaba0@programming.dev
          link
          fedilink
          arrow-up
          1
          ·
          1 year ago

          Memory is an implementation detail. You are interested in solving problems, not pushing bytes around, unless that is the problem itself. In 99% of the cases though, you don’t need guns and knives, it’s not a US. school (sorry)

        • LeFantome@programming.dev
          link
          fedilink
          arrow-up
          1
          ·
          1 year ago

          I do not like Java but this is a strange argument. The people that invented Java felt that most of the C language should be wrapped in unsafe.

          Opinions can vary but saying Java is not a real language is evidence free name calling. One could just as easily say that any language that does not allow you to differentiate between safe and unsafe baheviour is incomplete and not a “real” language. It is not just the Java and C# people that may say this. As a C fan, I am sure you have heard Rust people scoff at C as a legacy language that was fine for its day but clearly outclassed now that the “real” languages have arrived. Are you any more correct than they are?

  • korstmos@kbin.social
    link
    fedilink
    arrow-up
    48
    arrow-down
    1
    ·
    1 year ago

    Doubles have a much higher max value than ints, so if the method were to convert all doubles to ints they would not work for double values above 2^31-1.

    (It would work, but any value over 2^31-1 passed to such a function would get clamped to 2^31-1)

  • Marek Knápek@programming.dev
    link
    fedilink
    arrow-up
    32
    ·
    1 year ago

    Makes sense, how would you represent floor(1e42) or ceil(1e120) as integer? It would not fit into 32bit (unsigned) or 31bit (signed) integer. Not even into 64bit integer.

      • 1rre@discuss.tchncs.de
        link
        fedilink
        arrow-up
        4
        arrow-down
        1
        ·
        1 year ago

        I feel this is worse than double though because it’s a library type rather than a basic type but I guess ceil and floor are also library functions unlike toInt

  • maniacal_gaff@lemmy.world
    link
    fedilink
    arrow-up
    32
    arrow-down
    1
    ·
    1 year ago

    It would be kinda dumb to force everyone to keep casting back to a double, no? If the output were positive, should it have returned an unsigned integer as well?

    • baseless_discourse@mander.xyz
      link
      fedilink
      arrow-up
      4
      arrow-down
      2
      ·
      1 year ago

      I think one of the main reason to use floor/ceilling is to predictably cast a double into int. This type signature kind of defeats this important purpose.

      I don’t know this historical context of java, but possibly at that time, people see type more of a burden than a way to garentee correctness? (which is kind of still the case for many programmers, unfortunately.

  • Rev@ihax0r.com
    link
    fedilink
    English
    arrow-up
    25
    ·
    1 year ago

    python is like this also. I don’t remember a language that returned ints

  • Aelorius@jlai.lu
    link
    fedilink
    arrow-up
    11
    arrow-down
    4
    ·
    1 year ago

    Logic, in math, if you have a real and you round it, it’s always a real not an integer. If we follow your mind with abs(-1) of an integer it should return a unsigned and that makes no sense.

    • Kogasa@programming.dev
      link
      fedilink
      arrow-up
      23
      arrow-down
      1
      ·
      1 year ago

      in math, if you have a real and you round it, it’s always a real not an integer.

      No, that’s made up. Outside of very specific niche contexts the concept of a number having a single well-defined type isn’t relevant in math like it is in programming. The number 1 is almost always considered both an integer and a real number.

      If we follow your mind with abs(-1) of an integer it should return a unsigned and that makes no sense.

      How does that not make sense? abs is always a nonnegative integer value, why couldn’t it be an unsigned int?

      • Aelorius@jlai.lu
        link
        fedilink
        arrow-up
        5
        ·
        1 year ago

        I’m ok with that, but what I mean is that it makes no sense to change the type of the provided variable if in mathematics the type can be the same.

  • MrGeekman@lemmy.world
    link
    fedilink
    English
    arrow-up
    3
    ·
    1 year ago

    Try Math.round. It’s been like ten years since I used Java, but I’m pretty sure it’s in there.

  • Bappity@lemmy.world
    link
    fedilink
    English
    arrow-up
    6
    arrow-down
    23
    ·
    1 year ago

    the programming language Java meaning coffee is perfect because, like coffee, it tastes like shit but gets the job done

    • MrGeekman@lemmy.world
      link
      fedilink
      English
      arrow-up
      16
      ·
      1 year ago

      I think you need to try some lighter-roasted, higher-quality beans which were roasted fairly recently and only grind them a day or so before you use them. There are also different brewing methods and coffee/water ratios that you can try.

      • mestari@lemmy.world
        link
        fedilink
        arrow-up
        3
        ·
        1 year ago

        I love and consume lots of coffee but I sincerely believe it only tastes good because I associate the taste with the boost it gives. Exactly like cigarettes taste tolerable, good even, when you smoke them regularly.

        • MrGeekman@lemmy.world
          link
          fedilink
          arrow-up
          2
          ·
          1 year ago

          If you don’t know what you’re drinking, it’s probably dark roast. Dark roast is like charcoal compared to light roast.

          The coffee most folks use (i.e. Folgers, Maxwell House) is low-quality coffee made in haste to keep the price low enough for folks to be willing to buy it. They only offer darker roasts because disguise the inferior nature of the beans, or rather the inferior process. The unfortunate truth is that good coffee costs more to process because it takes longer to process and most folks don’t want to spend that much on coffee. So, you get what you pay for.