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浅析为什么char类型的范围是 -128~+127 - C/C++ - 清泛网 - 专注C/C++及内核技术
...变为1 1000 0000 这样才能转化为
-128输出，不然1000 0000 如何输出？这当然是我的一种推断，具体怎么实现还得问CPU的设计者了。。。。
再看一个例子：
char a=-129;
printf("%d",a) ; 会输入多少？？ 结果为127 ，为...
How to change default timezone for Active Record in Rails?
... as well. I have an inherited legacy PHP app that interacts with the same mysql database and stores all times as local; updating it to use UTC was not an option. What I had previously accomplished nothing: config.time_zone = 'Central Time (US & Canada)' config.active_record.default_timezone ...
PHP_SELF vs PATH_INFO vs SCRIPT_NAME vs REQUEST_URI
... The filename of the currently executing script, relative to the document root. For instance, $_SERVER['PHP_SELF'] in a script at the address http://example.com/test.php/foo.bar would be /test.php/foo.bar. The __FILE__ constant contains the full path and filename of the current (i.e. included) file...
/data/user/0/xxxx/files（内部存储）和 /storage/emulated/0/Android/data...
...，与应用绑定，用户无法直接通过文件管理器访问（需 Root）。外部存储：位于用户可见的存储空间（如 /sdcard/），路径可能因设备而异（如部分设备显示为 /mnt/sdcard）。
2. 访问方式与 API(1) 内部存储 (/data/user/0/xxxx)API 获取路径...
What is the difference between a directory and a folder?
...ditor I could found two sub-keys, Folder and Directory, under HKEY_CLASSES_ROOT.
I didn't know the difference until I created some values manually in registry and observed the differences of context menu items. If I create a node under HKEY_CLASSES_ROOT\Folder\shell only, I found that it appears in...
List all svn:externals recursively?
...
Do the following in the root of your working copy:
svn propget svn:externals -R
As discussed in the comments below, this does not list externals in externals.
Note for TortoiseSVN users: there is an option in the TortoiseSVN installer to also in...
ExecJS::RuntimeError on Windows trying to follow rubytutorial
... 2 was the accepted solution before actually finding information about the root issue we were having. The only reason we kept looking was that we couldn't believe the Rails team would (1) insert a line of code in every scaffold generated project that caused an issue, or (2) require that we install ...
What is the best project structure for a Python application? [closed]
...se in your projects. (Slight wrinkle: since on Windows, the interpreter is selected by the file extension, your Windows users actually do want the .py extension. So, when you package for Windows, you may want to add it. Unfortunately there's no easy distutils trick that I know of to automate this pr...
How to set child process' environment variable in Makefile
...
I have GNU make 3.81, and all: <\n\t>export PROJ_ROOT=$(CURDIR)<\n\t>echo $(PROJ_ROOT)<\n> outputs the correct expansion for the first row, but only echo for the second one. PROJ_ROOT is not set after running make. Spaces around = give "bad variable name" for ex...
Python Logging (function name, file name, line number) using a single file
...dy provided funcName variable
import logging
logger = logging.getLogger('root')
FORMAT = "[%(filename)s:%(lineno)s - %(funcName)20s() ] %(message)s"
logging.basicConfig(format=FORMAT)
logger.setLevel(logging.DEBUG)
Then anywhere you want, just add:
logger.debug('your message')
Example output...