kandi X-RAY | C Summary
kandi X-RAY | C Summary
The repository is a collection of open-source implementations of a variety of algorithms implemented in C and licensed under GPLv3 License. The algorithms span a variety of topics from computer science, mathematics and statistics, data science, machine learning, engineering, etc.. The implementations and their associated documentations are meant to provide a learning resource for educators and students. Hence, one may find more than one implementation for the same objective but using different algorithm strategies and optimizations.
Top functions reviewed by kandi - BETA
C Key Features
C Examples and Code Snippets
def convert_bytes_to_c_source(data, array_name, max_line_width=80, include_guard=None, include_path=None,
def run_benchmark_with_only_cpp_iterations(self, dataset): """Benchmarks the dataset with the iterations performed in C++.""" # NOTE: We use `dataset.skip()` to perform the iterations in C++, avoiding # the overhead of multiple `session.r
Trending Discussions on C
In my flutter project, I have made some updates of plugins and then used flutter upgrade. After that, whenever I am running my flutter project it is showing following error-...
ANSWERAnswered 2021-Dec-16 at 11:49
For me, cleaning and getting the packages didn't work. This error started after I upgraded flutter. I was on the master channel, a quick fix for me was to switch to stable.
I am getting this create React app error again and again even after doing the uninstall part.
npm uninstall -g create-react-app
up to date, audited 1 package in 570ms
found 0 vulnerabilities
npx create-react-app test-app
Need to install the following packages: create-react-app Ok to proceed? (y) y
You are running
create-react-app4.0.3, which is behind the latest release (5.0.0).
We no longer support global installation of Create React App.
Please remove any global installs with one of the following commands:
- npm uninstall -g create-react-app
- yarn global remove create-react-app
The latest instructions for creating a new app can be found here: https://create-react-app.dev/docs/getting-started/
ANSWERAnswered 2022-Jan-01 at 22:34
You will have to clear the npx cache to make it work.
You can locate the location of the folder where create-react-app is installed using
npm ls -g create-react-app.
Also, to clear the cache, refer to this answer in How can I clear the central cache for `npx`?
When I publish my ABP project I get the following error:...
ANSWERAnswered 2022-Jan-13 at 21:59
The issue raises after .NET 6 migration. There's a new feature that blocks multiple files from being copied to the same target directory with the same file name. See https://docs.microsoft.com/en-us/dotnet/core/compatibility/sdk/6.0/duplicate-files-in-output
Solution #1 (workaround):
You can add the following build property to all your publishable (*.Web) projects' *.csproj files. This property will bypass this check and works as previously, in .NET5.
After upgrading to android 12, the application is not compiling. It shows
"Manifest merger failed with multiple errors, see logs"
Error showing in Merged manifest:
Merging Errors: Error: android:exported needs to be explicitly specified for . Apps targeting Android 12 and higher are required to specify an explicit value for
android:exportedwhen the corresponding component has an intent filter defined. See https://developer.android.com/guide/topics/manifest/activity-element#exported for details. main manifest (this file)
I have set all the activity with
android:exported="false". But it is still showing this issue.
My manifest file:...
ANSWERAnswered 2021-Aug-04 at 09:18
I'm not sure what you're using to code, but in order to set it in Android Studio, open the manifest of your project and under the "activity" section, put android:exported="true"(or false if that is what you prefer). I have attached an example.
I know Python
// rounds towards negative infinity and in C++
/ is truncating, rounding towards 0.
And here's what I know so far:...
ANSWERAnswered 2022-Jan-18 at 21:46
Although I can't provide a formal definition of why/how the rounding modes were chosen as they were, the citation about compatibility with the
% operator, which you have included, does make sense when you consider that
% is not quite the same thing in C++ and Python.
In C++, it is the remainder operator, whereas, in Python, it is the modulus operator – and, when the two operands have different signs, these aren't necessarily the same thing. There are some fine explanations of the difference between these operators in the answers to: What's the difference between “mod” and “remainder”?
Now, considering this difference, the rounding (truncation) modes for integer division have to be as they are in the two languages, to ensure that the relationship you quoted,
(m/n)*n + m%n == m, remains valid.
Here are two short programs that demonstrate this in action (please forgive my somewhat naïve Python code – I'm a beginner in that language):
I made a bubble sort implementation in C, and was testing its performance when I noticed that the
-O3 flag made it run even slower than no flags at all! Meanwhile
-O2 was making it run a lot faster as expected.
ANSWERAnswered 2021-Oct-27 at 19:53
It looks like GCC's naïveté about store-forwarding stalls is hurting its auto-vectorization strategy here. See also Store forwarding by example for some practical benchmarks on Intel with hardware performance counters, and What are the costs of failed store-to-load forwarding on x86? Also Agner Fog's x86 optimization guides.
gcc -O3 enables
-ftree-vectorize and a few other options not included by
if-conversion to branchless
cmov, which is another way
-O3 can hurt with data patterns GCC didn't expect. By comparison, Clang enables auto-vectorization even at
-O2, although some of its optimizations are still only on at
It's doing 64-bit loads (and branching to store or not) on pairs of ints. This means, if we swapped the last iteration, this load comes half from that store, half from fresh memory, so we get a store-forwarding stall after every swap. But bubble sort often has long chains of swapping every iteration as an element bubbles far, so this is really bad.
(Bubble sort is bad in general, especially if implemented naively without keeping the previous iteration's second element around in a register. It can be interesting to analyze the asm details of exactly why it sucks, so it is fair enough for wanting to try.)
Anyway, this is pretty clearly an anti-optimization you should report on GCC Bugzilla with the "missed-optimization" keyword. Scalar loads are cheap, and store-forwarding stalls are costly. (Can modern x86 implementations store-forward from more than one prior store? no, nor can microarchitectures other than in-order Atom efficiently load when it partially overlaps with one previous store, and partially from data that has to come from the L1d cache.)
Even better would be to keep
buf[x+1] in a register and use it as
buf[x] in the next iteration, avoiding a store and load. (Like good hand-written asm bubble sort examples, a few of which exist on Stack Overflow.)
If it wasn't for the store-forwarding stalls (which AFAIK GCC doesn't know about in its cost model), this strategy might be about break-even. SSE 4.1 for a branchless
pmaxd comparator might be interesting, but that would mean always storing and the C source doesn't do that.
If this strategy of double-width load had any merit, it would be better implemented with pure integer on a 64-bit machine like x86-64, where you can operate on just the low 32 bits with garbage (or valuable data) in the upper half. E.g.,
The error message:
The minCompileSdk (31) specified in a dependency's AAR metadata (META-INF/com/android/build/gradle/aar-metadata.properties) is greater than this module's compileSdkVersion (android-30). Dependency: androidx.core:core-ktx:1.7.0-alpha02.
AAR metadata file:
ANSWERAnswered 2022-Jan-01 at 17:57
You're going to need to update your compile SDK to 31. It sounds like it's currently set to 30. In your Gradle files there should be something like
compileSdk in the
Bump that up to 31. If that's an issue for some reason, you can also bump down your dependencies to versions that don't require that compile SDK version.
I'm studying for the final exam for my introduction to C++ class. Our professor gave us this problem for practice:
Explain why the code produces the following output:
120 200 16 0
ANSWERAnswered 2021-Dec-13 at 20:55
It does not default to zero. The sample answer is wrong. Undefined behaviour is undefined; the value may be 0, it may be 100. Accessing it may cause a seg fault, or cause your computer to be formatted.
As to why it's not an error, it's because C++ is not required to do bounds checking on arrays. You could use a vector and use the
at function, which throws exceptions if you go outside the bounds, but arrays do not.
The undesired functionality
In Chrome 95 there was introduced new functionality where the user can hover and click on the unit part of a css value to hotswap the unit.
The feature is part of a package solution that has been labeled "Length Authoring Tools" in the release notes, and can be seen in action and described in detail in the release notes on the official blog.
How can this feature be disabled?
If a css-line in the inspector says
padding: 0 10px; then the user can click the
px-part of the line and open a selector that let's the user swap
px to other units such as
Clicking this part of the value no longer lets the user edit the entire value quickly. Most users already know what unit they desire to use beforehand, so they do not need to be helped to accidentally select
vw when working exclusively with
px everywhere else.
When selecting and copying properties from the inspector there is now inserted whitespaces/new lines between the value and the unit since the unit portion seems to be considered a separate element. This makes prototyping in the devtools and copy/pasting to external documents very tedious and broken.
ANSWERAnswered 2021-Nov-18 at 14:28
Updated answer 2021-11-16:
The following is mentioned in the official release notes for Chrome 96.
To disable Length Authoring Tools, navigate to this location in the DevTools and uncheck the checkbox:
Settings > Experiments > Enable CSS length authoring tools in the Styles pane.
But... The main issues regarding Length Authoring Tools have also been fully remedied in Chrome 96.
The initial incentive to disable these tools has been greatly diminished because of this.
A chevron will now appear to the right of the hovered value instead of reacting to clicks to the entire unit portion of it.
Copy paste now also works as intended.
It is now possible to disable the Length Authoring Tools, but you might no longer need to.
Old answer:You can't. (Though fixes are coming!)
It is not possible to toggle this feature in the current live stable release ( Chrome 95.0.4638.69 ).
But help is on its way...
Chrome 96 is scheduled to be released on November 16 2021 (source), or ~3 weeks after October 28 according to this official tweet. It will at least contain a revert to free text editing of css properties (source). Hopefully version 96 will address the issue completely, but if it doesn't then the next major release is scheduled for January 4 2021 (If this issue is unresolved by then somebody at Google should be fired).
As for now, Chrome Canary seems to have these fixes implemented and might be considered an alternative solution to the issue if you find the current state of Length Authoring Tools unbearable.
Please be advised that Chrome Canary can be quite unstable.
This question and answer will be edited and corrected once there are real fixes in the live stable version.
In C++20, we are now able to constrain the
auto keyword to only be of a specific type. So if I had some code that looked like the following without any constraints:
ANSWERAnswered 2021-Nov-01 at 18:38
A constraint on the deduced
auto type doesn't mean it needs to be a specific type, it means it needs to be one of a set of types that satisfy the constraint. Note that a constraint and a type are not the same thing, and they're not interchangeable.
e.g. a concept like std::integral constrains the deduced type to be an integral type, such as
long, but not
If I really need a
std::integraldatatype, couldn't I just omit the
In principle, I suppose you could, but this would at the minimum lead to parsing difficulties. e.g. in a declaration like
No vulnerabilities reported
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