Scientific counting is a convenient method used by scientists to represent very large or small numbers. It satisfies the regular expression +- ". " [0-9] + estrangement, that is, the integer part of a number has only one digit, and the decimal part has ...
I have an one-dimensional array, which contains the letter Amurz. If you want to find out all the unique combinations, the combination type is 1-to-many, for example: the letter A can be combined with any other one or more letters, please give a Demo or...
as a pc client, the QT5, client comes with a web browser and asks them that it comes with QT, but when I do front-end development on this browser, some of the CSS attributes are incompatible, such as this: cursor: pointer;, it seems to be unknown, and ho...
whether to write code is whether the more intermediate variables are written, the better such as a point: public class Point{ int x; x int y; y int isExist; x,y int quadrant; x,y } is it necessary to crea...
int flag = 1; setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&flag, sizeof(flag)); servertcptime_wait server2server socket reuseAddress, ...
I know that just because the socket send function returns successfully does not mean that the other party will receive it successfully. In general, we have to ask the other party to answer "copy " or not? Especially on the mobile end, the traffic on the...
write a function that divides words based on characters, and the above problem occurs when called. -sharpinclude<iostream> -sharpinclude<vector> -sharpinclude<string> using namespace std; vector<string> split(const string&...
when learning the reactor model today, I referred to the code written by others. reference blog address: https: blog.csdn.net u011693. the following are the questions to be asked: 1.reactorreactor_impl 2.reactor CPP rookie, also hope to be able t...
suppose that ABCD class, BC virtual inheritance from AMagle D inherited from BC,A class virtual function (not overridden at the same time in BC) and member variables belong to the internal of the class, if both of them solve the ambiguity, it can be solv...
ref: StackOverflow s question address The answer explained that weak reference counters have an impact on the life cycle of control block. I understand that new is different from make_shared, but I don t understand why control block needs to maint...
Update gcc, with brew under < H2 > mac there are a lot of header files that can t be used! < H2 > as the title for example, write a helloworld 1 -sharpinclude <stdio.h> 2 -sharpinclude <stdlib.h> 3 int main(){ 4 printf(&quo...
struct stc { int arr[1]; flexible array member is not supported in CPP }; void test(std::initializer_list<int> lst) { for (auto l : lst) std::cout << l << std::endl; } int main() { stc s; for (int i = 0; i &l...
the YUV420 data is obtained by pulling the data. How to transfer the CMSampleBuffer, that needs to be converted to kCVPixelFormatType_32BGRA? ...
test.cpp int main(){ return 0; } suppose a simple .cpp file is compiled into executable test, via gPP test.cpp-o test if other extraneous .cpp or library files are linked at compile time, such as gPP test.cpp-lpthread-o test , gPP test.cpp b...
I ve tried ver. 1.64.0. Cross-compilation for aarch64 boost uses version 1.64.0; cross-compilation uses platform centos 7, and the target platform is aarch64; cross-compilation tool . first step: . bootstrap.sh step 2: modify the project-config...
how does asp.net call internally? is this a static calling method? ask for similar code . public static string Getdata(string sql) { string connString = ConfigurationManager.ConnectionStrings["QHSE_ANConnectionString"].ToString...
background: the SDK of the hardware can obtain the time stamp and identification of the vehicle passing through a specific location. current practice: SDK stores the data in mysql, and web queries all the scores of all vehicles through polling, and the...
The function of placement new is to perform the construction of objects on the memory allocated by operator new, so did new operator use placement new after using operator new to request memory? If not, how is it constructed? Does it have anything to do ...
I am learning linked lists now. The linked list that the teacher taught us is different from the way it is realized on the Internet. So I want to know what are the advantages and disadvantages of these two implementations, and why the vast majority of p...
this is the insert function of the array linear table written in CPP. In the second if condition, there is no problem if you use listSize+1, but there is an error (non-compilation error) if you execute the listSizePP program . void insert(int location, ...
recently, I contacted kafka, and wanted to get data from kafka every half hour for updating and learning. I found a recommendation from relevant friends, which is to use flume to implement half-hour log rollback. The specific code is as follows -sharp ...
problem description now you need to debug the browser on the Android box, but I find that there is no way to debug the Android phone browser in the same way as chrome what result do you expect? What is the error message actually seen? you can chec...
in this question, you can AC with the following code: the time timeout is finally displayed. What is the reason for asking all the bosses? Is it true that one more comparison will time out, or is there something wrong with the program itself? ...
I would like to ask, what is the difference between creating html through document.createElement ( li ) and through innerHtml = ? also, if I created the element through createElement, can I empty it directly through innerHtml = ;? for exam...
how can I use flex to implement a layout similar to the left and right layout in the red box above the traditional method is float:left on the left and float: right, on the right. If you don t know how to implement it with flex, please post the co...