QT : exists(file) requires one argument

The "exists(file)" function in QT requires one argument, which should be a QString representing the file path. This function checks whether the specified file exists in the file system and returns a boolean value indicating the result. For example, you can use it like this:

QString filePath = "/path/to/my/file.txt";
if (QFile::exists(filePath)) {
    // do something
} else {
    // file does not exist
}

Make sure to provide the correct file path as the argument to this function.