string c 2b 2b

1std::string str = "hello world"; 
2char *str = "hello world";
3char str[] = "hello world"; 
4char str[11] = "hello world"; 

1// Include the string library
2#include <string>
3
4// Create a string variable
5string greeting = "Hello";

1#include <string>
2#include <iostream>
3#include <type_traits>
4#include <cstring>
5
6int main() {
7  std::string str = "Hello, there";
8  std::cout << std::boolalpha
9  << str.capacity() << ", " << str.size() << ", " << std::strlen(str.data()) // 12, 12, 12
10  << '\n' << std::is_same_v<std::string, std::basic_string<char>> // true
11  << '\n' << str.front() + str.substr(1, 10) + str.back() // Hello there
12  << '\n' << str[0] // H
13  << '\n';
14  
15  str += "!"; 
16  std::cout << str << '\n'; // Hello, there!
17  str.erase(4, 4); // Hellhere!
18  str.pop_back(); // Hellhere
19  str.insert(4, " "); // Hell here
20  std::cout << str << '\n'; // Hell here
21  
22}

1#include <string>
2string hello= "hello you thre :)";

1// string::operator[]
2#include <iostream>
3#include <string>
4
5int main ()
6{
7  std::string str ("Test string");
8  for (int i=0; i<str.length(); ++i)
9  {
10    std::cout << str[i];
11  }
12  return 0;
13}

1#include <string>
2std::begin		| returns an iterator to the beginning of a container 
3std::end		| returns an iterator to the end of a container 
4std::size		| returns the length of string
5std::to_string	| converts a number to string
6std::stoi		| converts a string to a signed integer
7std::getline 	| read data from an I/O stream into a string
8std::swap  		| specializes the std::swap algorithm
9std::empty 		| checks whether the container is empty