To convert an integer input (more than one character) into a string output in C++, several methods can be utilized. The most recommended approach is to use `std::stringstream`, which provides a convenient way to handle the conversion. Alternatively, the C-style function `sprintf` can be employed for this purpose. For those looking for a custom solution, creating a personalized conversion method is also an option. Each method has its own advantages, with `std::stringstream` being favored for its ease of use and type safety, while `sprintf` may be preferred for performance in certain scenarios.