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Editorial Team
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Asked: 2026-06-08T22:52:32+00:00

I have a 64-bit long containing an IEEE 754 representation of a double .

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I have a 64-bit long containing an IEEE 754 representation of a double. I’d like to convert it to a string just like the standard Java Double.toString(d) does. However, I can’t use any of the methods of the Double class, because they are buggy. (String.valueOf(d) and "" + d don’t work either, because they use Double.toString(d) internally. NumberFormat doesn’t work, because it loses precision.) So I need pure Java code which would do the conversion.

Where can I find such code? I tried the source code of GNU Classpath, but it uses a native method for this conversion.

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1 Answer

  1. Editorial Team

    I searched a bit and I found that: dtoa.java.
    It seems complicated, but the code is under the GPL license (or the Mozilla Public License 1.1 license).

    I hope it will help you.

    (I even found the bug you refer to.)

    Edit:

    [Andrew Thompson] is right, you often (always?) lose precision with floating point.
    As pointed here, you might want to use BigDecimal

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