#includeIn this example, we create two string objects with different values. We use the `empty` function to determine if the strings are empty or not. The first string, `str1`, is not empty, so the program outputs "str1 is not empty". The second string, `str2`, is empty, so the program outputs "str2 is empty". This example uses the Fox Toolkit library, which provides a set of GUI controls and related utilities for use in C++ programs.int main() { FXString str1 = "hello world"; FXString str2 = ""; if (str1.empty()) { std::cout << "str1 is empty" << std::endl; } else { std::cout << "str1 is not empty" << std::endl; } if (str2.empty()) { std::cout << "str2 is empty" << std::endl; } else { std::cout << "str2 is not empty" << std::endl; } return 0; }