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FAQ Section: SMS - Frequently Asked Questions - MIT App Inventor Community
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How to drop column with constraint?
...I did upvote the above answer also, though, just out of that flinchy old habit of SELECTing and inspecting first before deciding to drop.
– noogrub
Jan 13 '14 at 16:46
7
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How to convert SSH keypairs generated using PuTTYgen (Windows) into key-pairs used by ssh-agent and
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answered Feb 8 '10 at 19:18
Kaleb PedersonKaleb Pederson
42.5k1818 gold badges9393 silver badges144144 bronze badges
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Why doesn't C have unsigned floats?
...ned integers in C/C++:
value >> shift
signed values leave the top bit unchanged (sign extend), unsigned values clear the top bit.
The reason there is no unsigned float is that you quickly run into all sorts of problems if there are no negative values. Consider this:
float a = 2.0f, b = 10...
Is there a performance difference between i++ and ++i in C++?
...if you don't have a specific reason to use i++.]
For C++, the answer is a bit more complicated.
If i is a simple type (not an instance of a C++ class), then the answer given for C ("No there is no performance difference") holds, since the compiler is generating the code.
However, if i is an insta...
What's the _ underscore representative of in Swift References?
...
Both answers were correct but I want to clarify a little bit more.
_ is used to modify external parameter name behavior for methods.
In Local and External Parameter Names for Methods section of the documentation, it says:
Swift gives the first parameter name in a method a loc...
Filter rows which contain a certain string
...disp hp drat wt qsec vs am gear carb type
1 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 Mazda RX4
2 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4 Mazda RX4 Wag
3 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1 Toyota Corolla
4 21.5 4 120.1 97 3.70 2.465 20.0...
What is the meaning of “__attribute__((packed, aligned(4))) ”
... address, it will do this in word sized chunks (e.g. 4 byte chunks on a 32-bit system). Data alignment means putting the data at a memory offset equal to some multiple of the word size, which increases the system's performance due to the way the CPU handles memory.
To align the data, it may be nece...
How to make a window always stay on top in .Net?
I have a C# winforms app that runs a macro in another program. The other program will continually pop up windows and generally make things look, for lack of a better word, crazy. I want to implement a cancel button that will stop the process from running, but I cannot seem to get the window to sta...
How to determine the Boost version on a system?
...o to the include directory, and open up version.hpp. BOOST_VERSION takes a bit of deciphering, but BOOST_LIB_VERSION is pretty clear. The value of mine is currently "1_42"
– T.E.D.
Sep 14 '10 at 12:44
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