What are the methods for using the string class in C++?

In C++, the string class is a commonly used class for manipulating strings, providing a range of methods to handle and process strings. Here are some common application methods of the string class:

1. length(): Returns the length of the string.
2. size(): returns the length of the string, equivalent to the function of length().
3. empty(): Check if the string is empty and return a boolean value.
4. at(): returns the character at the specified position.
5. front(): returns the first character of the string.
6. back(): Returns the last character of the string.
7. substr() function: returns a substring.
8. Append(): Add other strings to the end of a string.
9. Insert(): To insert another string at a specified position.
10. erase(): delete characters from a string within a specified range.
11. replace() function: Replaces characters within a specified range with another string.
12. find(): locate the position of a specified string in the current string.
13. rfind(): Searches for the specified string in the current string starting from the end of the string.
14. compare(): compare two strings in dictionary order.
15. c_str(): Convert a string to a C-style string.
16. Convert other data types to strings using to_string().
17. getline(): reads a line of string from the input stream.
18. push_back(): add a character to the end of a string.
19. Remove the last character of the string using pop_back().

These are just some common methods of the string class, there are more methods available that can be found in the official C++ documentation.