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虚拟摇杆使用指导 · App Inventor 2 中文网
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方向数设为 4，先用蓝牙客户端连上小车（如 HC-05 模块），小车程序约定 F 前进、B 后退、L 左转、R 右转、S 停车：
各案例独立使用；组合到同一屏幕时，将同名事件的处理合并到一个事件积木中。
when 虚拟摇杆1.Directio...
What is the difference between conversion specifiers %i and %d in formatted IO functions (*printf /
...ger as a signed decimal number, but %i defaults to decimal but also allows hexadecimal (if preceded by 0x) and octal (if preceded by 0).
So 033 would be 27 with %i but 33 with %d.
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Generating Guids in Ruby
...e tokens in Ruby
>> require 'digest'
=> []
>> Digest::SHA1.hexdigest("some-random-string")[8..16]
=> "2ebe5597f"
>> SecureRandom.base64(8).gsub("/","_").gsub(/=+$/,"")
=> "AEWQyovNFo0"
>> rand(36**8).to_s(36)
=> "uur0cj2h"
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Where are my postgres *.conf files?
...e_min_age = 50000000
#vacuum_freeze_table_age = 150000000
#bytea_output = 'hex' # hex, escape
#xmlbinary = 'base64'
#xmloption = 'content'
# - Locale and Formatting -
datestyle = 'iso, mdy'
#intervalstyle = 'postgres'
#timezone = '(defaults to server environment setting)'
#timezone_abbre...
Does Git warn me if a shorthand commit ID can refer to 2 different commits?
...RT_NAME_AMBIGUOUS))
return error("short SHA1 %.*s is ambiguous.", len, hex_pfx);
and this:
if (!ds->candidate_checked)
/*
* If this is the only candidate, there is no point
* calling the disambiguation hint callback.
*
* On the other hand, if the current candidate
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Why cannot cast Integer to String in java?
...gue, Integer.toString(myInt, radix) that lets you specify whether you want hex, octal, etc. If you want to be consistent in your code (purely aesthetically, I guess) the second form can be used in more places.
Edit 2 I assumed you meant that your integer was an int and not an Integer. If it's alrea...
CentOS+Nginx+PHP+MySQL详细配置(图解) - PHP - 清泛IT论坛，有思想、有深度
...前，很多朋友都搭建过Apache+PHP，Apache+PHP编译后生成的是模块文件，而Nginx+PHP需要PHP生成可执行文件才可以，所以要利用fastcgi技术来实现N ginx与PHP的整合，这个只要我们安装是启用FastCGI即可。此次我们安装PHP不仅使用了FastCGI，...
Convert HashBytes to VarChar
...ave found the solution else where:
SELECT SUBSTRING(master.dbo.fn_varbintohexstr(HashBytes('MD5', 'HelloWorld')), 3, 32)
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How to allocate aligned memory only using the standard library?
...nd the PRIXPTR macro is the correct printf() length and type specifier for hex output for a uintptr_t value. The alternative is to use %p but the output from that varies by platform (some add a leading 0x, most don't) and is typically written with lower-case hex digits, which I dislike; what I wrote...
Adding a background image to a element
...ckground: color url('path')"></div>
Where:
color is color in hex or one from X11 Colors
path is path to the image
others like position, attachament
background CSS Property is a connection of all background-xxx propieties in that syntax:
background:
background-color
background-im...