Status Checking

ErrorClass checks if the status reflects an error of a predefined class.
Fortran:
Predicate = DftiErrorClass (Status, Error_Class) C:
predicate = DftiErrorClass (status, error_class);

ErrorMessage generates an error message.
Fortran:
ERROR_MESSAGE = DftiErrorMessage (Status) C:
error_message = DftiErrorMessage (status);