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How to work with complex numbers in C?
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int main() {
double complex z1 = 1.0 + 3.0 * I;
double complex z2 = 1.0 - 4.0 * I;
printf("Working with complex numbers:\n\v");
printf("Starting values: Z1 = %.2f + %.2fi\tZ2 = %.2f %+.2fi\n", creal(z1), cimag(z1), creal(z2), cimag(z2));
double complex sum = z1 + z2;
pr...
Can I install the “app store” in an IOS simulator?
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121
This is NOT possible
The Simulator does not run ARM code, ONLY x86 code. Unless you have the r...
What does rake db:test:prepare actually do?
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answered Mar 2 '13 at 2:26
Richard BrownRichard Brown
10.9k44 gold badges2929 silver badges4242 bronze badges
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How to get the error message from the error code returned by GetLastError()?
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//Returns the last Win32 error, in string format. Returns an empty string if there is no error.
std::string GetLastErrorAsString()
{
//Get the error message, if any.
DWORD errorMessageID = ::GetLastError();
if(errorMessageID == 0)
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What is the purpose of the word 'self'?
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24 Answers
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What breaking changes are introduced in C++11?
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The FDIS has a section for incompatibilities, at appendix C.2 "C++ and ISO C++ 2003".
Summary, paraphrasing the FDIS here, to make it (better) suitable as a SO answer. I added some examples of my own to illustrate the differences.
There are a few library-related incompatibilities w...
How do you detect Credit card type based on number?
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29 Answers
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How can I merge properties of two JavaScript objects dynamically?
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PostgreSQL - fetch the row which has the Max value for a column
...id, time_stamp))
Bill's query has a cost estimate of 93k, and completes in 2.9 seconds (given a compound index on (usr_id, trans_id))
Query #1 below has a cost estimate of 16k, and completes in 800ms (given a compound index on (usr_id, trans_id, time_stamp))
Query #2 below has a cost estimate of 14k...