Recent posts

Failed To Compile React App

The following error is displayed when I open the create-react-app with npm start. I'm new to React and have had no problem using the command line to create a new app in the last few days. I tried to start npx, start npm, and reinstall npm for the updated version. Compilation...



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karoli Mitto Written on 06/26/2019 in Question

Java8 String To String List

I have a list of channels like: List <String> locations = Arrays.asList ("US: 5423", "US: 6321", "CA: 1326", "AU: 5631"); And I want to convert Map <String, List <String >> like this: AU = [5631] CA = [1326] US = [5423, 6321] How can I do that?



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alexis abrego Written on 06/26/2019 in Question

COMPILE TIME ERROR AS STD::STR

Due to a bug, I just discovered that this code works well with Visual Studio 17 and probably also with other compilers. Now I am curious to know why? #include <iostream> #include <string> std :: string foo () { returns nullptr; }int main () { car s = foo (); std :: cout << s <<...



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Julinee James Written on 06/26/2019 in Question

Spaces To String List

I have the chain and the board. Strings have the same number of letters as arrays. I have to divide s to create a list that has the same length as each element. s = ‘Python programming language’ arr = [‘lkjhgf’, ‘zx’, ‘qw’, ‘ertyuiopakk’, ‘foacdhlc’] How can I get my expected result?



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charles perkin Written on 06/26/2019 in Question

MATH.RANDOM() And Basic Logic

I wrote a simple code to compare random array differences and found something that I do not quite understand.I generate 2 tables filled with random numbers. Add differences between random numbers Print the average difference I would have expected the result to be a random number close to 0.5, but...



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Louis E Easton Written on 06/26/2019 in Question

XCODE 11: Doesnot Show

I'm trying to run the new Canvas Xcode 11 feature, but the canvas is not showing. What am I doing wrong?I just created a new standard project (single-view application), compiled it and activated 'Editor> Editor and Canvas'. I can browse all the files in the project, nothing is displayed....



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Geace Jovo Written on 06/26/2019 in Question

Android And Appcompact Manifest Merger Failed

I updated 'android.support:appcompat-v7' to 28.0.0. However, this resulted in a design error. In my Logcat: Fusion manifest, this error failed. How can I solve this problem?



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Angon dela Written on 06/26/2019 in Question

Setting Extra Bits In Bool

If I get a Boolean variable and put its second bit at 1, the variable is evaluated as true and false at the same time. Compile the following code with gcc6.3 with the -g option (gcc-v6.3.0 / linux / RHEL6.0-2016-x86_64 / bin / g ++ -g main.cpp -o mytest_d)...



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White Harris Written on 06/26/2019 in Question

FLOOR FUNCTION C++

I want to define an effective whole floor function, i. e. A float or double conversion, which truncates to minus infinity. Can you imagine ideas to increase your performance in terms of speed, accuracy or range?



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Cameron Msjamie Written on 06/26/2019 in Question

Removing Inheritance Reated Code

I need to implement many derived classes with different constant member data. Data processing should be in the base class, but I can not find an elegant way to access the derived data. The following code works, but I do not really like it. The code must be run...



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Lloyd I Neale Written on 06/26/2019 in Question