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What does the constant 0.0039215689 represent?

...modern compilers may be smart enough to do this optimization, they are not allowed to do it unless you explicitly tell them to via a compiler flag. Related: Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)? share ...
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If isset $_POST

.... empty space is considered as set. You need to use empty() for checking all null options. share | improve this answer | follow | ...
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How to find out which view is focused?

... Call getCurrentFocus() on the Activity. share | improve this answer | follow | ...
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What is the purpose of a plus symbol before a variable?

this really sounds like a simple question but I had no luck searching. what does the +d in 3 Answers ...
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Chrome Developer Tools: How to find out what is overriding a CSS rule?

... what if ALL of them are cancelled? Probably due to a script? How do you find out who did it? – darkgaze Jun 23 '17 at 8:28 ...
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Does the GitHub traffic graph include your own views?

I have several projects on GitHub, and they all have the traffic graph where I can view how much traffic my repository is getting. ...
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Automatic creation date for Django model form objects?

What's the best way to set a creation date for an object automatically, and also a field that will record when the object was last updated? ...
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Is there a way to automate the android sdk installation?

Now I have to download and install the Android SDK and AVD Manager, and then install the APIs, tools through the UI. Is there a way to automate this process? ...
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CSS attribute selector does not work a href

...a query string or hash fragment. If we combine the 3 cases we should match all pdf links. a[href$='.pdf'], a[href*='.pdf?'], a[href*='.pdf#'] { background: red; } share | improve this answer ...
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Should I Stop Stopwatch at the end of the method?

...o a Stopwatch isn't doing any work or eating cpu clock cycles between the calls to Start() and Stop(). Start() just sets a timestamp to now and Stop() calculates and saves the time elapsed since that. See source in coreclr: github.com/dotnet/corefx/blob/master/src/… – Sammi ...