How do I concatenate strings in C++ using std::string?

How do I concatenate strings in C++ using std::string?

You can concatenate strings in C++ using the '+' operator or the 'append()' method of std::string.

Can you show me an example using both methods?

Sure! Here's an example:

#include <iostream>
#include <string>

int main() {
    std::string str1 = "Hello";
    std::string str2 = "World";

    // Using '+' operator
    std::string result1 = str1 + " " + str2;

    // Using 'append()' method
    std::string result2 = str1;
    result2.append(" ").append(str2);

    std::cout << result1 << std::endl;
    std::cout << result2 << std::endl;
    return 0;
}

What will be the output of this code?

The output will be:

Hello World
Hello World

Both methods produce the same result!

Are there any performance differences between the two methods?

Generally, the '+' operator is more readable, while 'append()' can be more efficient in certain cases, especially in loops.