<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[swebcc的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/swebcc</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; swebcc]]></copyright><item><title><![CDATA[int为什么最大值为2^31-1(2的31次方-1)]]></title><link>https://blog.youkuaiyun.com/swebcc/article/details/122250855</link><guid>https://blog.youkuaiyun.com/swebcc/article/details/122250855</guid><author>swebcc</author><pubDate>Fri, 31 Dec 2021 10:43:13 +0800</pubDate><description><![CDATA[int 占用内存32位, 最高位是符号位, 因此 int的值为:
2^31 +  2^30 +2^29+ ```+2^1 +2^0
设
x = 2^31 +  2^30 + 2^29  +• • •+ 2^1 + 2^0
两边同时乘以2得:
2x=2^32+ 2^31+ 2^30 +  • • • + 2^2 + 2^1
那么x:
2x - x = (2^32+ 2^31+ 2^30 +  • • • + 2^2 + 2^1) - (2^31 +  2^30 + 2^29  +• • •+ 2^1 + 2^]]></description><category></category></item><item><title><![CDATA[pycharm debug 提示 Python Debugger Extension Available Cython extension speeds up Python debugging]]></title><link>https://blog.youkuaiyun.com/swebcc/article/details/121296952</link><guid>https://blog.youkuaiyun.com/swebcc/article/details/121296952</guid><author>swebcc</author><pubDate>Fri, 12 Nov 2021 22:07:17 +0800</pubDate><description><![CDATA[提示如图

点击install 之后

然后我就去下载了build tools 然并卵, 依然报错. 然后去jetbrains 看了一下 
You don’t need to do anything !!!
我真的是R了, 行, jetbrains , 你狠. windows 或者 mac 下的同学如果看着碍眼. 设置里把这个通知关了吧


...]]></description><category></category></item><item><title><![CDATA[关闭centos命令模式的警告声音]]></title><link>https://blog.youkuaiyun.com/swebcc/article/details/103353554</link><guid>https://blog.youkuaiyun.com/swebcc/article/details/103353554</guid><author>swebcc</author><pubDate>Mon, 02 Dec 2019 17:45:45 +0800</pubDate><description><![CDATA[关闭centos命令模式的警告声音
vim /etc/inputrc

set bell-style visible

#bell-style的取值范围是:none, visible, audible，

想把警告声去掉把/etc/inputrc 中的set bell-style 的值改为 visible，并将注释去掉，再reboot 或 shutdown -r now重启系统就OK啦。

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