What are the functions of the string in C++?

In C++, the string class is a class provided by the standard library for representing and manipulating strings. The string class offers many functionalities, including:

1. The creation and assignment of strings: Strings can be created and assigned using constructors, assignment operators, and copy constructors.
2. Accessing and modifying strings: Characters in a string can be accessed and modified using indexes, iterators, and other methods.
3. You can connect and concatenate strings by using the plus operator or the append() method.
4. String comparison: You can compare strings using comparison operators or the compare() method.
5. Find and replacement of strings: You can use the find() method to locate the position of a specified substring within a string and use the replace() method to substitute a substring within the string.
6. Splitting and dividing strings: You can use the substr() method to extract substrings, and use methods like find_first_of() to achieve splitting and dividing of strings.
7. The length and size of a string can be obtained using methods such as size() or length().
8. To clear or delete a string: you can use the clear() method to empty the string, and the erase() method to remove specific characters or substrings.
9. Converting and formatting strings: You can use the c_str() method to convert a string to a C-style string, use the to_string() method to convert integers and other types to strings, and use functions like sprintf() to achieve formatted output of strings.
10. String input and output: You can use stream operators, getline() function, and others to handle string input and output.

Generally speaking, the string class offers a wide range of functions and methods, making manipulating strings in C++ more convenient and efficient.