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App Inventor 2开发简单计算器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...序执行过程、跟踪变量值的方法，可以帮我们找到原因。问题出在输入等号之后，此时： 前数=计算结果 后数=0 算符=“”接下来输入算符，由于算符=“”，因此执行点击算符过程的“如果...则”分支，第一行代码为【前数=后数...
Visual Studio 64 bit?
... for the built in version and standalone. You have to target "x86" or "Any CPU" so that you can see your xaml, then retarget 64 so you can run and debug. Ditto edit and continue. The list goes on. It is so totally not awesome, I do not have words fit to print.
– Dirk Bester
...
.NET JIT potential error?
... new x86 configuration (I'm on running X64 Windows 2008 and was using 'Any CPU')
Debug Build
Got the correct output both F5 and CTRL+F5
Release Build
Correct output with Debugger attached
No debugger - Got the incorrect output
So it is the x86 JIT incorrectly generating the code. Have delet...
Warning on “diff.renamelimit variable” when doing git push
...
Although it also could be viewed as a hard-coded bound on the amount of CPU
time we're willing to allow users to tell git to spend on handling
renames.
An upper bound may make sense, but unfortunately this upper
bound was neither communicated to the users, nor documented anywhere.
Al...
Why doesn't JavaScript support multithreading?
...he internal mechanism (aka callback/promise/async-await)
if you need to do CPU bound ops, then use worker threads.
Worker threads are intended to be long-living threads, meaning you spawn a background thread and then you communicate with it via message passing.
Otherwise, if you need to execute a...
how to File.listFiles in alphabetical order?
...
@CPU100 i believe that by using the list() instead of listFiles() gives the advantage of having only the file names without the parent directory paths, resulting in shorter strings and lesser cpu time to sort/compare.
...
What RSA key length should I use for my SSL certificates?
...cated because they could be cracked given a small datacenter (thousands of CPU or hundreds of GPU, in maybe a few months). It may seem a lot but it was well within reach of any large organization or government.
2048 bits
2048 bits RSA certificates are currently the accepted norm in use.
Default ...
How does a “stack overflow” occur and how do you prevent it?
...nsumes as much as 64 bytes on the stack (32 bit processor, saving half the CPU registers, flags, etc)
Keep your call tree shallow (similar to the above statement)
Web servers
It depends on the 'sandbox' you have whether you can control or even see the stack. Chances are good you can treat web se...
How would Git handle a SHA-1 collision on a blob?
...ations. This took the equivalent processing power as 6,500 years of single-CPU computations and 110 years of single-GPU computations.
b/ would forge one file (with the same SHA1), but with the additional constraint its content and size would produce the identical SHA1 (a collision on the content al...
linux下iptables配置详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...成DROP的话)
允许loopback!(不然会导致DNS无法正常关闭等问题)
IPTABLES -A INPUT -i lo -p all -j ACCEPT (如果是INPUT DROP)
IPTABLES -A OUTPUT -o lo -p all -j ACCEPT(如果是OUTPUT DROP)
下面写OUTPUT链,OUTPUT链默认规则是ACCEPT,所以我们就写需要DROP(放弃)...