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Average of 3 long integers
...
This code will work, but isn't that pretty.
It first divides all three values (it floors the values, so you 'lose' the remainder), and then divides the remainder:
long n = x / 3
+ y / 3
+ z / 3
+ ( x % 3
+ y % 3
+ z % 3
)...
开源MQTT网关：EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区，为创新赋能！
... EMQX 5.0 可在 23 个节点的单集群中建立 1 亿个并发的 MQTT 连接。优点：支持大规模部署高可用性横向可扩展性高性能和高可靠丰富的企业功能率先采用 MQTT over QUIC
缺点：上手复杂难以有效管理
社区情况EMQX 是 GitHub 上评价最高...
Are static class variables possible in Python?
... the value of the class attribute using x instance
assert x.i == Test.i # ERROR
assert Test.i == 3 # Test.i was not affected
assert x.i == 12 # x.i is a different object than Test.i
This is because the line x.i = 12 has added a new instance attribute i to x instead of changing the value o...
How to create a directory in Java?
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-1: That is actually a really bad technique to create a directory. The access to the FS is not reserved to a dedicated resource. Between if(!theDir.exists()) and theDir.mkdir() the status could have changed, as well as it could change in bet...
How do you run your own code alongside Tkinter's event loop?
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The solution posted by Bjorn results in a "RuntimeError: Calling Tcl from different appartment" message on my computer (RedHat Enterprise 5, python 2.6.1). Bjorn might not have gotten this message, since, according to one place I checked, mishandling threading with Tkinter ...
Is < faster than
... will not be faster on most architectures. You didn't specify, but on x86, all of the integral comparisons will be typically implemented in two machine instructions:
A test or cmp instruction, which sets EFLAGS
And a Jcc (jump) instruction, depending on the comparison type (and code layout):
jne ...
Intellij code formatting, Java annotations on new lines
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I think all the above answers are correct but here is step by step for Mac users:
Click on "IntelliJ IDEA"
Click on "Preferences"
Go "Code Style" on the left navigation window and you will see "Java" listed below it and Click on it...
How can I get the behavior of GNU's readlink -f on a Mac?
...T=$PHYS_DIR/$TARGET_FILE
echo $RESULT
Note that this doesn't include any error handling. Of particular importance, it doesn't detect symlink cycles. A simple way to do this would be to count the number of times you go around the loop and fail if you hit an improbably large number, such as 1,000....
Constructor of an abstract class in C#
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Far as I know we can't instantiate an abstract class
There's your error right there. Of course you can instantiate an abstract class.
abstract class Animal {}
class Giraffe : Animal {}
...
Animal animal = new Giraffe();
There's an instance of Animal right there. You instantiate an abstr...
自己搭建的MQTT云服务器 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...致命问题：每次打开我的APP后，要手动订阅一遍主题 ...
连接状态的管理问题，你输出每次的连接状态看看，看App退到后台再激活后连接状态是啥。必要的时候，需要做一个重连逻辑。我在APP界面中添加了1个标签，专门用来显示...