Because errors on FILE streams are persisted until clearerr, it should be sufficient to check the return value of fflush at the end of the program. Presumably t

Because errors on FILE streams are persisted until clearerr, it should be sufficient to check the return value of fflush at the end of the program. Presumably the FILE I/O interface was deliberately designed this way, so error checking could be consolidated at the end of a series of operations.