#includeIn this example, we create a QUuid object called "myUuid" and then call the isNull() method to determine if it is null or not. The Qt framework is the package library containing the QUuid class.#include int main(int argc, char *argv[]) { QUuid myUuid; if (myUuid.isNull()) { qDebug() << "myUuid is null"; } else { qDebug() << "myUuid is not null"; } return 0; }