std::string str1 = "apple"; std::string str2 = "banana"; if (str1.compare(str2) == 0) { std::cout << "The strings are equal." << std::endl; } if (str1.compare(str2) < 0) { std::cout << "The first string is less than the second string." << std::endl; } if (str1.compare(str2) > 0) { std::cout << "The first string is greater than the second string." << std::endl; }This code compares two string objects `str1` and `str2`. Depending on the result of the comparison, it prints out a message describing the relationship between the strings. The `compare()` method is part of the C++ standard library, which is included in the C++ standard template library (STL). Therefore, the package library is the STL.