What are some examples of using std::string in C++?

Can you give me some examples of using std::string in C++?

Sure! Here are a few examples of using std::string in C++:

1. Creating a string: std::string str = "Hello, World!";
2. Concatenation: std::string fullName = firstName + " " + lastName;
3. Finding a substring: size_t pos = str.find("World");
4. Getting the length: size_t length = str.length();
5. Accessing characters: char firstChar = str[0];

Would you like to see more examples or explanations?

Yes, can you explain how to concatenate strings?

Absolutely! In C++, you can concatenate strings using the + operator. For example:

std::string str1 = "Hello";
std::string str2 = "World";
std::string result = str1 + " " + str2; // result is "Hello World"

You can also use the append method:

str1.append(" ").append(str2);

This will give you the same result. Would you like to know more about string methods?

What about string comparison?

String comparison in C++ can be done using relational operators like ==, !=, <, >, etc. For example:

std::string str1 = "apple";
std::string str2 = "banana";
if (str1 < str2) {
    std::cout << "str1 is less than str2";
}

You can also use the compare method:

if (str1.compare(str2) < 0) {
    std::cout << "str1 is less than str2";
}

Would you like to explore more string functionalities?

Yes, please show me how to convert a string to an integer.

To convert a string to an integer in C++, you can use the std::stoi function. Here's an example:

std::string numberStr = "12345";
int number = std::stoi(numberStr);

This will convert the string "12345" to the integer 12345. If the string cannot be converted, it will throw an exception. Would you like to know about converting other types?