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How to convert a byte array to a hex string in Java?
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A Guava solution, for completeness:
import com.google.common.io.BaseEncoding;
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byte[] bytes = "Hello world".getBytes(StandardCharsets.UTF_8);
final String hex = BaseEncoding.base16().lowerCase().encode(bytes);
Now hex is "48656c6c6f20776f726c64".
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Truncating floats in Python
...using the IEEE floating-point format into the sequence of bits (assuming a 64-bit float)
0011111111010011001100110011001100110011001100110011001100110011
This is the closest value to 0.3 that can accurately be represented as an IEEE float. But if you write 0.29999999999999998 in a Python program,...
Is there a perfect algorithm for chess? [closed]
...l endgames with 6 pieces or less have been enumerated and solved. See tablebase and bitbase here: en.wikipedia.org/wiki/Tablebase. For example, there's a KQNKRBN endgame where 517 moves are required to force a mate! But the total number of chess games is around (10^(10^50)).
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How can you detect the version of a browser?
...://unpkg.com/bowser@2.4.0/es5.js"></script>
*supports Edge based on Chromium
Platform.js by bestiejs - 2,250★s - Last updated Oct 30, 2018 - 5.9KB
console.log(platform);
document.write("You are using " + platform.name +
" v" + platform.version +
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What are invalid characters in XML
... characters), then probably it's better to use some kind of encoding (e.g. base64).
C语言结构体里的成员数组和指针 - c++1y / stl - 清泛IT社区，为创新赋能！
...t;p的偏移之所以是0x8而不是0x6，是因为内存对齐了（我在64位系统上）。关于内存对齐，可参看《深入理解C语言》一文。好了，现在你知道为什么原题中会访问到了0x4的地址了吧，因为是相对地址。相对地址有很好多处，其可以...
Is it okay to use now?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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What exception classes are in the standard C++ library
...system_error> from operating system or other C API
std::ios_base::failure <ios> Input or output error
Source: http://en.cppreference.com/w/cpp/error/exception
In practice, most exceptions are custom exceptions derived from logic_error and runtime_error. Not that these are neg...
MySQL error: key specification without a key length
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64
You can specify the key length in the alter table request, something like:
alter table authors...
How to create a file in memory for user to download, but not through server?
...dia. Example:
<a href="data:application/octet-stream;charset=utf-16le;base64,//5mAG8AbwAgAGIAYQByAAoA">text file</a>
The octet-stream is to force a download prompt. Otherwise, it will probably open in the browser.
For CSV, you can use:
<a href="data:application/octet-stream,fie...