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What is the difference between atan and atan2 in C++?
...ntended for the origin to be in the middle, and things can go backwards or down. That's what you'd use in a screen representation, because it DOES matter what direction you want the curve to go. So atan2 can give you negative numbers, because its cero is in the center, and its result is something yo...
The requested operation cannot be performed on a file with a user-mapped section open
... environment. Left it running overnight (memory test - it passed), shut it down in the morning, a couple of small code changes, and suddenly couldn't finish my build because of this. Weird how this memory seemed to conflict like this.
– ouflak
Jul 17 '14 at 7:4...
Interview questions: WPF Developer [closed]
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Personally I would sit them down in front of a standard developer build machine and ask them to complete some task. No questions, just see what their code is like after a couple of hours (or more if the task is longer).
I have had a zero failure rate o...
What's the best practice for primary keys in tables?
...ple omit primary key because they transfer a lot of data and it might slow down (depend of the database) the process. BUT, it should be added after it.
Some one comment about link table, this is right, it's an exception BUT fields should be FK to keep the integrity, and is some case those fields ca...
Is it safe to get values from a java.util.HashMap from multiple threads (no modification)?
...ill decide whether it is safe or not: safe publication. The "answer" boils down to "it's trickly" and here are three (complex) links you can read.
– BeeOnRope
Feb 1 '17 at 20:38
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OpenLayers vs Google Maps? [closed]
...fficult, while OpenLayers makes it easy.
Google reserves the right to shut down access to the API if you're showing a map with content it finds objectionable. The example given in the FAQ is a map of illegal drugs, which gives a good sense of the gray areas this restriction might cover.
See this F...
How to hide reference counts in VS2013?
...Options / Environment / Fonts and Colours.
In the "Show Settings For" drop-down, select "CodeLens"
Choose the smallest font you can find e.g. Calibri 6.
Change the foreground colour to your editor foreground colour (say "White")
Click OK.
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When and why will a compiler initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete?
...t's not the OS - it's the compiler. You can modify the behaviour too - see down the bottom of this post.
Microsoft Visual Studio generates (in Debug mode) a binary that pre-fills stack memory with 0xCC. It also inserts a space between every stack frame in order to detect buffer overflows. A very si...
How to split a string into an array of characters in Python?
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The task boils down to iterating over characters of the string and collecting them into a list. The most naïve solution would look like
result = []
for character in string:
result.append(character)
Of course, it can be shortened to ...
Why is printing “B” dramatically slower than printing “#”?
...ng the discrepancy, then yes, not printing is a debugging trick. It comes down to, which problem are you trying to solve?
– Bob Kerns
Mar 3 '14 at 12:27
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