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static const vs #define
...ou might want to take a look at the C++ FAQ Lite for this question:
http://www.parashift.com/c++-faq-lite/newbie.html#faq-29.7
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How do short URLs services work?
...atabase Table:
ID URL VisitCount
1 www.google.com 26
2 www.stackoverflow.com 2048
3 www.reddit.com 64
...
20103 www.digg.com 201
20104 www.4chan.com ...
submitting a GET form with query string params and hidden params disappear
...t what hidden parameters are for to start with...?
<form action="http://www.example.com" method="GET">
<input type="hidden" name="a" value="1" />
<input type="hidden" name="b" value="2" />
<input type="hidden" name="c" value="3" />
<input type="submit" />
&l...
What's the difference between a single precision and double precision floating point operation?
...ch precision they can store the numbers.
For example: I have to store 123.456789 One may be able to store only 123.4567 while other may be able to store the exact 123.456789.
So, basically we want to know how much accurately can the number be stored and is what we call precision.
Quoting @A...
How to extract base URL from a string in JavaScript?
...nally the port of the URL.
For example, location.origin of the URL http://www.sitename.com/article/2009/09/14/this-is-an-article/ is http://www.sitename.com.
To target browsers without support for location.origin use the following concise polyfill:
if (typeof location.origin === 'undefined')
...
Linux 搭建NTP时间同步服务器 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
... 标注：如果对crontab定时任务不熟悉请查看本博客 http://www.cnblogs.com/zoulongbin/p/6187238.html
3、Windows客户端
控制面板->日期和时间->设置日期和时间->Internet时间->更改设置
输入对应的NTP服务器IP，然后确定即可，如下图：
...
Summarizing multiple columns with dplyr? [duplicate]
...brary(dplyr)
library(purrrlyr)
library(data.table)
library(bench)
set.seed(123)
n <- 10000
df <- data.frame(
a = sample(1:5, n, replace = TRUE),
b = sample(1:5, n, replace = TRUE),
c = sample(1:5, n, replace = TRUE),
d = sample(1:5, n, replace = TRUE),
grp = sample(1:3, n, replac...
Retrieving parameters from a URL
...
import urlparse
url = 'http://example.com/?q=abc&p=123'
par = urlparse.parse_qs(urlparse.urlparse(url).query)
print par['q'][0], par['p'][0]
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Does Python have “private” variables in classes?
...names the variable.
class A:
def __init__(self):
self.__var = 123
def printVar(self):
print self.__var
Now, if you try to access __var outside the class definition, it will fail:
>>>x = A()
>>>x.__var # this will return error: "A has no attribute __var...
Write a number with two decimal places SQL server
...ters to display, and the number of decimal places to display
Select Str(12345.6789, 12, 3)
displays: ' 12345.679' ( 3 spaces, 5 digits 12345, a decimal point, and three decimal digits (679). - it rounds if it has to truncate, (unless the integer part is too large for the total size, in whic...