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浮点数在内存中的表示 - C/C++ - 清泛网 - 专注C/C++及内核技术
...值最好用fabs(i) < 0.0000001
下面再来看看浮点数在内存中是如何表示的吧。
如：125.5 = 1111101.1(1.1111011*2^6)，三个段分别为 0, 10000101(127+6=133), 11110110000000000000000
下面提供一个Demo，大家有兴趣的话可以直接修改自行验证其他的例...
WCF：使用Array替代List - 更多技术 - 清泛网 - 专注C/C++及内核技术
...类型的数据结果存在这么大的差异？
不同点在于SOAP消息如何生成：
对于List<byte>：
...
<s:Body u:Id="_0"
xmlns:u="http://docs.oasis-open.org/wss/2004/01/
oasis-200401-wss-wssecurity-utility-1.0.xsd">
<SendData xmlns="http://tempuri.org/">
<array
x...
How do you get a list of the names of all files present in a directory in Node.js?
...= walk.walk('./test', { followLinks: false });
walker.on('file', function(root, stat, next) {
// Add this file to the list of files
files.push(root + '/' + stat.name);
next();
});
walker.on('end', function() {
console.log(files);
});
...
How to get next/previous record in MySQL?
...ding that a primary key colum is not meant as a column to sort by, because MySQL does not guarantee that higher, auto incremented, values are necessarily added at a later time.
If you don't care about this, and simply need the record with a higher (or lower) id then this will suffice. Just don't us...
Prevent direct access to a php include file
...direct access to files is to place them outside of the web-server document root (usually, one level above). You can still include them, but there is no possibility of someone accessing them through an http request.
I usually go all the way, and place all of my PHP files outside of the document root...
How can I get the MAC and the IP address of a connected client in PHP?
...you need to do is to put arp into diferrent group.
Default:
-rwxr-xr-x 1 root root 48K 2008-11-11 18:11 /usr/sbin/arp*
With command:
sudo chown root:www-data /usr/sbin/arp
you will get:
-rwxr-xr-x 1 root www-data 48K 2008-11-11 18:11 /usr/sbin/arp*
And because apache is a daemon running un...
Joining three tables using MySQL
I have three tables named
8 Answers
8
...
PHP: Convert any string to UTF-8 without knowing the original character set, or at least try
...a pure UTF-8 stack all the way through to your database. I have been using MySQL's utf8mb4 encoding for tables, fields, and connections.
My situation boiled down to "I just want my sanitizers, validators, business logic, and prepared statements to deal with UTF-8 when data comes from HTML forms, or...
How to delete from select in MySQL?
This code doesn't work for MySQL 5.0, how to re-write it to make it work
4 Answers
4
...
How to import classes defined in __init__.py
...atch, os
from lib.settings import Values
from lib import Helper
print
for root, dirs, files in os.walk('.'):
for f in fnmatch.filter(files, '*.py'):
print "# %s/%s" % (os.path.basename(root), f)
print open(os.path.join(root, f)).read()
print
# lib/helper.py
print 'help...