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How to get a random number in Ruby
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If you're not only seeking for a number but also hex or uuid it's worth mentioning that the SecureRandom module found its way from ActiveSupport to the ruby core in 1.9.2+. So without the need for a full blown framework:
require 'securerandom'
p SecureRandom.random_number...
What does (x ^ 0x1) != 0 mean?
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^ is the bitwise XOR operation
0x1 is 1 in hex notation
x ^ 0x1 will invert the last bit of x (refer to the XOR truth table in the link above if that's not clear to you).
So, the condition (0 != ( x ^ 0x1 )) will be true if x is greater than 1 or if the last bit of ...
Parsing HTML into NSAttributedText - how to set font?
...ability to set text color, just add color to style attribute with value in hex string format color: #000000. See this link for converting UIColor to hex string: gist.github.com/yannickl/16f0ed38f0698d9a8ae7
– Miroslav Hrivik
Aug 16 '17 at 14:19
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20个命令行工具监控 Linux 系统性能 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... FIFO 0,17 953 /dev/initctl
4. tcpdump — 网络数据包分析器
tcpdump 是一种使用最广泛的命令行网络数据包分析器或数据包嗅探程序，主要用于捕获和过滤 TCP/IP 包收到或者转移在一个网络的特定借口信息。它也提供了...
Find CRLF in Notepad++
...ither Ctrl+M, $ nor \r\n are matched.
The same wiki also mentions the Hex editor alternative:
Type the new string at the beginning of the document.
Then select to view the document in Hex mode.
Select one of the new lines and hit Ctrl+H.
While you have the Replace dialog box up...
What does the git index contain EXACTLY?
...e we haven't modified the file
The first bytes are seconds since EPOCH in hex:
date --date="@$(printf "%x" "540976e6")"
Gives:
Fri Sep 5 10:40:06 CEST 2014
Which is when I made this example.
The second 4 bytes are nanoseconds.
UID and GID are 00 00 03 e8, 1000 in hex: a common value for sin...
从Sloodle看三维虚拟学习环境的发展趋势 - 资讯 - 清泛网 - 专注C/C++及内核技术
...空虚的体验和无意义的技能。而且学生行动和言论的详细数据也可通过后台自动收集下来 ,为学生评估提供了巨大的潜力。无论从学生学习过程体验 ,还是在形成性、诊断性评价方面来看 ,三维虚拟学习环境都可以帮助学生提供满...
How do I print a double value with full precision using cout?
...ctual double (with NO ROUND OFF ERROR) is to print out the binary bits (or hex nybbles).
One way of doing that is using a union to type-pun the double to a integer and then printing the integer, since integers do not suffer from truncation or round-off issues. (Type punning like this is not supporte...
When to use -retainCount?
...umber like 1152921504606846975 looks very mysterious until you write it in hex and get 0xfffffffffffffff. And 9223372036854775807 is 0x7fffffffffffffff in hex. And it really is not so surprising that someone would choose to use values like these as flags, given that it would take almost 3000 years ...
BMP 和 DIB - C/C++ - 清泛网 - 专注C/C++及内核技术
...：1,2,3,4组成了BMP，2,3,4组成了DIB
1.BMP文件头：
BMP文件头数据结构含有BMP文件的类型、文件大小和位图起始位置等信息。
其结构定义如下：
2. DIB头
BMP位图信息头数据用于说明位图的尺寸等信息。下面两个图，左边是C++里...