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How much faster is C++ than C#?
...e faster in C++, and you're sure that C++ won't conflict with your other requirements, go for C++. In any other case, concentrate on first implementing your application correctly in whatever language suits you best, then find performance bottlenecks if it runs too slow, and then think about how to o...
How do I give text or an image a transparent background using CSS?
...nt semi-transparent but have the content (text & images) of the element opaque?
30 Answers
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What's wrong with nullable columns in composite primary keys?
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Primary keys are for uniquely identifying rows. This is done by comparing all parts of a key to the input.
Per definition, NULL cannot be part of a successful comparison. Even a comparison to itself (NULL = NULL) will fail. This means a key contai...
Understanding checked vs unchecked exceptions in Java
...e hate them.
Here's my extended view on the topic.
As for the particular questions:
Is the NumberFormatException consider a checked exception?
No. NumberFormatException is unchecked (= is subclass of RuntimeException). Why? I don't know. (but there should have been a method isValidInteger(..))
I...
Can I use view pager with views (not with fragments)
... For a complete working example, check out the code found on this question: stackoverflow.com/q/7263291
– Tiago
Jan 14 '14 at 22:08
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What is the difference between localStorage, sessionStorage, session and cookies?
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This is an extremely broad scope question, and a lot of the pros/cons will be contextual to the situation.
In all cases, these storage mechanisms will be specific to an individual browser on an individual computer/device. Any requirement to store data on an...
Amazon S3 CORS (Cross-Origin Resource Sharing) and Firefox cross-domain font loading
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Update September 10, 2014:
You shouldn't need to do any of the query string hacks below anymore since Cloudfront properly supports CORS now. See http://aws.amazon.com/blogs/aws/enhanced-cloudfront-customization/ and this answer for more info: https://stackoverflow.com/a/25305915/308315
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SPAN vs DIV (inline-block)
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The original question asked about what is valid, and for validation, <span> and <div> are indeed different, as <span> is an inline element (valid within a <p>, for instance), while <div> is a block element (n...
How can I quantify difference between two images?
...ors rather than images.
However, there are some decisions to make first.
Questions
You should answer these questions first:
Are images of the same shape and dimension?
If not, you may need to resize or crop them. PIL library will help to do it in Python.
If they are taken with the same settin...
Explain the use of a bit vector for determining if all characters are unique
...ed size, which is 32 bits. Is that mean it can only test 32 characters' unique? I have test that, this function could test "abcdefgZZ" is false, but "abcdefg@@" return true.
– tli2020
Jan 14 '14 at 2:12
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