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Is multiplication and division using shift operators in C actually faster?
...n to shift, shift. If you mean to multiply, multiply. Do what is semantically clearest--your coworkers will thank you later. Or, more likely, curse you later if you do otherwise.
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Calculate a Running Total in SQL Server
Imagine the following table (called TestTable ):
15 Answers
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How to wait in a batch script? [duplicate]
...ist on your Windows XP box? According to this post: http://malektips.com/xp_dos_0002.html sleep isn't available on Windows XP, and you have to download the Windows 2003 Resource Kit in order to get it.
Chakrit's answer gives you another way to pause, too.
Try running sleep 10 from a command prompt...
Grouping functions (tapply, by, aggregate) and the *apply family
Whenever I want to do something "map"py in R, I usually try to use a function in the apply family.
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Why escape_javascript before rendering a partial?
I'm looking at this Railscast episode and wondering why the call to escape_javascript is needed here:
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How can I stop .gitignore from appearing in the list of untracked files?
...on.
So, add it to your repository, it should not be gitignored.
If you really want you can add .gitignore to the .gitignore file if you don't want it to be committed. However, in that case it's probably better to add the ignores to .git/info/exclude, a special checkout-local file that works just l...
Find which commit is currently checked out in Git
...detached at c1abcde <== RIGHT HERE
Option 5: git bisect visualize
Finally, while you're doing a git bisect, you can also simply use git bisect visualize or its built-in alias git bisect view to launch gitk, so that you can graphically view which commit you are on, as well as which commits you ...
How to choose the id generation strategy when using JPA and Hibernate
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The API Doc are very clear on this.
All generators implement the interface org.hibernate.id.IdentifierGenerator. This is a very simple interface. Some applications can choose to provide their own specialized implementations, however, Hibernate provides a range ...
How to initialize all the elements of an array to any specific value in java
...t() function which can fulfill my wish but in Java how can i initialize all the elements to a specific value? Whenever we write int[] array=new int[10]; , this simply initialize an array of size 10 having all elements equal to zero. I just want to change this initialization integer for one of m...
[since C++11] std::array的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...y<char> as a fix sized c-string.
array<char, 100> str = {0}; // all elements initialized with 0.
char *p = str.data();
strcpy(p, "hello world");
printf("%s\n", p); // hello world
END_TEST;
上面这个例子让我想起了std::string, 它有一个c_str()方法，...