std::string myString = "Hello World!"; myString.replace(0, 5, "Goodbye");
std::string myString = "Hello World!"; myString.replace(6, 6, "you");
std::string myString = "Hello World!"; myString.replace(0, myString.length(), "Goodbye Cruel World!");In this example, the entire string is replaced with the new string `"Goodbye Cruel World!"`. The resulting string is now `"Goodbye Cruel World!"`. Overall, `std::string::replace` is a very useful function for manipulating strings in C++. It offers a lot of flexibility and ease of use, especially when it comes to creating and updating strings in a program.