db: db.o students.o courses.o enrolls.o
	cc db.o students.o courses.o enrolls.o -o db
db.o: db.c types.h students.h courses.h enrolls.h db.h
	cc -c db.c
students.o: students.c types.h students.h
	cc -c students.c
courses.o: courses.c types.h courses.h
	cc -c courses.c
enrolls.o: enrolls.c types.h students.h courses.h enrolls.h
	cc -c enrolls.c