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Why are hexadecimal numbers prefixed with 0x?
...ramming number systems were decimal and octal — mainframes had 12, 24 or 36 bits per byte, which is nicely divisible by 3 = log2(8).
The BCPL language used the syntax 8 1234 for octal numbers. When Ken Thompson created B from BCPL, he used the 0 prefix instead. This is great because
an integer ...
使用TokuMX配置Replica Set集群 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...中，只有一个实例是Primary角色，其他都是Secondary角色。
3、默认情况下，只有Primary实例可读可写，Secondary角色不可读写。
4、可以手工配置Secondary实例使之可读。
5、当Primay实例宕机后，其余的实例会尝试选举出一个新的实例...
Failed to locate the winutils binary in the hadoop binary path
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edited Sep 5 '19 at 14:30
Ganesh Jadhav
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answer...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
..., c) = 0
offsetof(struct foo, x) = 1
arr[0].x = 10
arr[1].x = 20
p0 = ffbff317
p1 = ffbff31c
Bus error
In both cases, the program is compiled with no extra options, just gcc packed.c -o packed.
(A program that uses a single struct rather than array doesn't reliably exhibit the problem, since the ...
Remove specific characters from a string in Python
...2.x versions *, you can instead use str.translate, (but read on for Python 3 differences):
line = line.translate(None, '!@#$')
or regular expression replacement with re.sub
import re
line = re.sub('[!@#$]', '', line)
The characters enclosed in brackets constitute a character class. Any charac...
C-like structures in Python
...
352
Use a named tuple, which was added to the collections module in the standard library in Python...
Java's Virtual Machine and CLR
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edited Apr 10 '15 at 23:13
Community♦
111 silver badge
answered Jan 26 '09 at 16:21
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Purpose of Unions in C and C++
...n one of the Technical Corrigenda to the C99 standard (see DR#257 and DR#283). However, keep in mind that formally this does not protect you from running into undefined behavior by attempting to read a trap representation.
s...
How do I rename an open file in Emacs?
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Vladimir Panteleev
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answered Dec 21 '08 at 11:09
Matt CurtisMatt...
TCP 的那些事儿（上） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...《TCP/IP 详解 卷1：协议》（当然，你也可以去读一下RFC793以及后面N多的RFC）。另外，本文我会使用英文术语，这样方便你通过这些英文关键词来查找相关的技术文档。
之所以想写这篇文章，目的有三个，
一个是想锻炼一下...