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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
..., 它的八位都用来存储数值, 没有符号位,编译器把 -1 转换为补码为 1111 1111,但由于是无符号,计算机会把 1111 11111 当做是无符号来对待 ,自然就是 2^8 -1 = 255 了,所以相当于是if( 1>255) 肯定是
printf("小于");了。。。
。...
MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区,为创新赋能!
...条消息就发送上千条采集的数据,或者比较大的设备阴影文件。技术挑战TCP需要解决的问题是在IP包传输过程中,处理异构网络环境下的网络拥塞、丢包、乱序、重复包等多种问题。MQTT解决的问题是,在低带宽高延迟不可靠的网...
Byte order mark screws up file reading in Java
I'm trying to read CSV files using Java. Some of the files may have a byte order mark in the beginning, but not all. When present, the byte order gets read along with the rest of the first line, thus causing problems with string compares.
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How to read a (static) file from inside a Python package?
...init__.py
│ ├── get_predictions.py
│ ├── languages.csv
│ └── utils.py
├── README.md
├── setup.cfg
└── setup.py
you need this code:
import pkg_resources
# __name__ in case you're within the package
# - otherwise it would be 'lidtk' in this exa...
BIO与NIO、AIO的区别(这个容易理解) - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...塞的,而采用select函数有个好处就是它可以同时监听多个文件句柄,从而提高系统的并发性!
异步非阻塞IO:在此种模式下,用户进程只需要发起一个IO操作然后立即返回,等IO操作真正的完成以后,应用程序会得到IO操作完成的...
理解和配置 Linux 下的 OOM Killer - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...给系统用,不致于让系统立刻崩溃。如果检查相关的日志文件(/var/log/messages)就会看到下面类似的 Out of memory: Kill process 信息:
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Out of memory: Kill process 9682 (mysqld) score 9 or sacrifice child
Killed process 9682, UID 27, (mysqld) total-vm:47...
使用std::string作为std::map的key出错解决 - C/C++ - 清泛网 - 专注C/C++及内核技术
...string”不定义该运算符或到预定义运算符可接收的类型的转换
反正是乱七八糟的错误,原因很简单,少了 #include <string>
(注意,不是string.h,如果包含了string.h,请改为string)std::string std::map key
ServiceStack vs ASP.Net Web API [closed]
...cellent MVC Mini Profiler)
Includes Sql Profiling
JSON/JSONP, XML, JSV, CSV and SOAP end-points
The RestServiceBase and ServiceBase classes are intended to host your custom C# logic for maximum potential re-use as possible, e.g. Its DTO-first design trivially allows for deferred and proxied exe...
Elegant setup of Python logging in Django
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I am currently using a logging system, which I created myself. It uses CSV format for logging.
django-csvlog
This project still doesn't have full documentation, but I am working on it.
share
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30条爆笑的程序员梗 PHP是最好的语言 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...憋屈的事情就是:你辛辛苦苦熬夜写了一个风格优雅的源文件,被一个代码风格极差的同事改了且没署名,以至于别人都以为是你写的。
24.应聘
程序员应聘必备词汇:了解=听过名字;熟悉=知道是啥;熟练=用过;精通=做过东西。
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