How to use string in c++

In C, string is a standard library type used to represent text. Its features include: dynamic arrays, variable-length character sets; string objects can be created through literals, copying, or C-style strings; elements can be accessed using the subscript operator or front()/back() methods; assignment operators, The append()/insert() method modifies string; provides operations such as substring search, string comparison, concatenation, case conversion, etc.; it is safer and more functional than C-style strings, but may incur additional memory overhead.

string Usage in C

string is a standard library type used in C to represent text data. It is a dynamic array that stores a variable-length collection of characters. string objects behave like C-style strings but provide richer functionality and safety.

Create a string object

There are several ways to create a string object:

• Create from a literal: "string s = "Hello world";"
• Copy from other string:string s1 = "Hello"; string s2(s1);
• Create from C-style string:string s(cstr, length); Where cstr is a C-style string and length is the string length.

Access string elements

• Use the subscript operator: s[index] Access the character at the specified position.
• Use the front() and back() methods to access the first and last characters.

Modify string

• Use assignment operator: s = "New string";
• Use the append() method to append characters at the end: s.append("!");
• Use the insert() method to insert characters at the specified position: s.insert(index , "ABC");

Other string operations

• Find substrings: find() Compare strings with rfind() method
• :==,!=,<,>,<=,>= operator
• Connection string: Operator
• Convert case: tolower() and toupper() method

Advantages

• Compared with C-style strings, string objects are safer and more powerful.
• Provides rich string operation functions.
• Dynamically allocate memory, allowing storage of variable-length text data.

Disadvantages

• Using string objects may incur additional memory overhead compared to using C-style strings.

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