Fix C++ Format Function Issues

In C++, there is no built-in format function. If you need to format output, you can use the printf function or output using std::cout introduced in C++11. For more flexible formatting, you can use std::stringstream for string stream operations before outputting.

If you need to format strings, you can use the format library of std::string, such as fmt library or boost::format library.

If you encounter an error, it may be because you have not included the appropriate header file or are using the wrong function name. Please make sure your code includes the correct header file and that the function name is spelled correctly. If the issue persists, provide more code details for better assistance in resolving the problem.