Category：C++
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Time：2021-8-2
The C + + standard library does not provide the so-called date type. C + + inherits the structures and functions of C language for date and time operations. In order to use date and time related functions and structures, they need to be referenced in C + + programsHeader file. There are […]
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Time：2021-7-31
I shared an article before to show the great side of C language, and then someone commented on a “garbage” below. Personally, I think you don’t like C language and shouldn’t slander it. It’s good for you to have your favorite language, but you can’t say other languages “rubbish”. This principle is also applicable in […]
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Time：2021-7-30
A reference variable is an alias, that is, it is another name for an existing variable. Once a reference is initialized to a variable, you can use the reference name or variable name to point to the variable. C + + reference vs pointer References are easily confused with pointers. There are three main differences […]
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Time：2021-7-29
Since qscroller is at least above qt5.0, if the version is too low, it is recommended to see it58. Tablewidget simulates finger slidingChapter, customize the implementation slider Before learning this chapter, you need to know the key words of sliding: Press the mouse and slide the mouse:It refers to that the user presses the screen […]
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Time：2021-7-28
Nowadays, HTTPS protocol is being widely valued and used. At the beginning of this year, many websites under chrome announced that they would not upgrade from HTTPS to HTTP security. When you open many websites, you will find a green security lock in the upper left corner of the browser, which proves that the website […]
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Time：2021-7-27
preface: This article is mainly the reading notes of modern C + + tutorial. When I was an undergraduate, I entered the door by learning C language, and then I have been programming with the habit of C language; When I was a freshman in the software institute, I came into contact with Java and […]
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Time：2021-7-26
To measure whether a language (in a broad sense, not only programming language) is complex, we can look at the number of words, part of speech changes and grammatical structure. eight According to relevant data, up to the latest C + + 20, there are about 99 keywords in C + + and 6 names […]
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Time：2021-7-25
C + + has a way to represent character sequences as class objects in its definition. This class is called an STD:: string. The string class stores characters as byte sequences and has the function of allowing access to single byte characters. STD:: string and character array Character arrays are just character arrays that can […]
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Time：2021-7-24
The C + + standard library provides a rich set of input / output functions, which will be introduced in subsequent chapters. This chapter will discuss the most basic and common I / O operations in C + + programming. C + + I / O occurs in a stream, which is a sequence of […]
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Time：2021-7-23
If you want to keep N decimal places According to the explanation on the C + + official website, this function has no specified return type, and it is used to set the exact decimal place on the output operation. This function is only used to modify the data stream if the return value is […]
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Time：2021-7-22
Cilect #include #include #include #define HELLO_PORT 7905 #define HELLO_GROUP “224.0.0.1” #pragma comment(lib,”ws2_32.lib”) using namespace std; int main() { WSADATA wsaData;// initialization //Initialize socket WSAStartup(MAKEWORD(2, 2), &wsaData); sockaddr_ in RecvAddr; // server address sockaddr_ in SenderAddr; // Local address int localPort = 4001; // local port int Port = 4000; // Server listening port […]
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Time：2021-7-21
Server #include #include #include #pragma comment(lib,”ws2_32.lib”) #define PORT 6060 #define IP “ff02::2” #define BUF_LEN 256 int main(int argc, char* argv[]) { WSADATA wsaData; WORD wVersionRequested; // edition wVersionRequested = MAKEWORD(1, 1); // Version information WSAStartup(wVersionRequested, &wsaData); // Initialize windows socket library //Use this structure to specify the local or remote endpoint […]
