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Why prefer two's complement over sign-and-magnitude for signed numbers?
...o add them.
Two's complement addition is very simple. You add numbers normally and any carry bit at the end is discarded. So they're added as follows:
0010
+ 1111
=10001
= 0001 (discard the carry)
0001 is 1, which is the expected result of "2+(-1)".
But in your "intuitive" method, adding is m...
内存管理内幕：动态分配的选择、折衷和实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
...他程序使用。
实现这些需求的程序库称为 分配程序（allocators），因为它们负责分配和回收内存。程序的动态性越强，内存 管理就越重要，您的内存分配程序的选择也就更重要。让我们来了解可用于内存管理的不同方法，它...
MVC 4 Razor File Upload
...
I think, better way is use HttpPostedFileBase in your controller or API. After this you can simple detect size, type etc.
File properties you can find here:
MVC3 How to check if HttpPostedFileBase is an image
For example ImageApi:
[HttpPost]
[Route("api/image")]
public ActionResult In...
MySQL DROP all tables, ignoring foreign keys
Is there a nice easy way to drop all tables from a MySQL database, ignoring any foreign key constraints that may be in there?
...
How to use web-fonts legally? [closed]
...int products, on graphics on your web site, etc., but you are almost never allowed to re-distribute a digital version of the font, not even to display it on your web site using Tools like sIFR. If you want to make sure, and big things are at stake, make sure and contact the font vendor first.
There...
Understanding __get__ and __set__ and Python descriptors
...th the Temperature class). For example:
temp=Temperature()
temp.celsius #calls celsius.__get__
Accessing the property you assigned the descriptor to (celsius in the above example) calls the appropriate descriptor method.
instance in __get__ is the instance of the class (so above, __get__ would r...
How to do a SOAP Web Service call from Java class?
...ch, you'll have to:
Make the call:
Use the SAAJ (SOAP with Attachments API for Java) framework (see below, it's shipped with Java SE 1.6 or above) to make the calls; or
You can also do it through java.net.HttpUrlconnection (and some java.io handling).
Turn the objects into and back from XML:
...
Hibernate SessionFactory vs. JPA EntityManagerFactory
...hat are not available in the EntityManager, you can obtain the session by calling:
Session session = entityManager.unwrap(Session.class);
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What's the difference between SoftReference and WeakReference in Java?
... strong enough to
force an object to remain in memory.
Weak references allow you to leverage
the garbage collector's ability to
determine reachability for you, so you
don't have to do it yourself. You
create a weak reference like this:
WeakReference weakWidget = new WeakReference(widget...
What do I use for a max-heap implementation in Python?
... amazed that there IS such a built-in solution in heapq. But then it is totally unreasonable that it is NOT even slightly mentioned at all in the official document! WTF!
– RayLuo
Apr 21 '15 at 6:48
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