string is included in the string library (not string.h, not .h). It can define a string variable just like defining a character, and the powerful C also has various built-in Function, the basic implementation eliminates the need to hand-write functions, and can also perform lexicographic comparisons and string operations.
1. Bitwise and string operations
For example
string s = "abcdef"; cout << s[0] << endl;
The result should be the output character 'a', and the string type can also be used Directly add another string, for example
string a = "abc", b = "bcd"; a = a + b; cout << a << endl;
The result should be the output string "abcbcd".
2. Built-in functions
The string type actually includes many functions, such as
string s = "a"; s.append(2,'b');//s.append(n,c);在s串后面加入n个c字符(append还有其他用法,详情可百度) s.erase(s.begin(),s.begin()+2);//s.erase(l,r);删除某个区间,l,r都为迭代器 s.erase(it);//删除一个字符,it为迭代器 s.size();//返回字符串s的长度大小 s.begin();//返回首位置的迭代器 s.end();//返回末位置的迭代器 s.insert(it,ch);//在it位置插入ch字符,it为迭代器 s.resize(len,c);//把字符串当前大小置为len,并用c填充不足的部分 s.empty();//判断是否为空串 s.length();//返回字符串的长度 s.max_size();//返回当前系统string对象可存放的最大长度 s.capacity();//返回当前容量 s.at(k);//返回第k+1个字符(该用法会坚持是否越界) s.c_str();//返回C字符串的指针,内容为s串 s.find(s1);//查找s中是否包含s1,并返回头位置,找不到则返回string::npos s.replace(k,x,ch);//从k位置开始,把后面的x个元素替换为ch(还有很多其他用法) s.swap(s2);//交换两个string字符串
and string also supports direct comparison of two strings. size (built-in lexicographic comparison).
Of course, in addition to the functions written above, string has many other functions.
Recommended tutorial: c tutorial
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C# and .NET runtime work closely together to empower developers to efficient, powerful and cross-platform development capabilities. 1) C# is a type-safe and object-oriented programming language designed to integrate seamlessly with the .NET framework. 2) The .NET runtime manages the execution of C# code, provides garbage collection, type safety and other services, and ensures efficient and cross-platform operation.

To start C#.NET development, you need to: 1. Understand the basic knowledge of C# and the core concepts of the .NET framework; 2. Master the basic concepts of variables, data types, control structures, functions and classes; 3. Learn advanced features of C#, such as LINQ and asynchronous programming; 4. Be familiar with debugging techniques and performance optimization methods for common errors. With these steps, you can gradually penetrate the world of C#.NET and write efficient applications.

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C#.NET is still important because it provides powerful tools and libraries that support multiple application development. 1) C# combines .NET framework to make development efficient and convenient. 2) C#'s type safety and garbage collection mechanism enhance its advantages. 3) .NET provides a cross-platform running environment and rich APIs, improving development flexibility.

C#.NETisversatileforbothwebanddesktopdevelopment.1)Forweb,useASP.NETfordynamicapplications.2)Fordesktop,employWindowsFormsorWPFforrichinterfaces.3)UseXamarinforcross-platformdevelopment,enablingcodesharingacrossWindows,macOS,Linux,andmobiledevices.


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DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software