// main header file
// assignment 2
// Dan J. Fraser

// nothing but function declarations for void functions here, no worries. :)

void read_students();

void read_profs();

void read_grads();

void read_courses();



void add_undergrad();

void del_undergrad();

void add_grad();

void del_grad();

void add_prof();

void del_prof();

void change_supervisor();

void change_mark();

void print_undergrads();

void print_grads();

void print_profs();

void print_students_by_course();

void print_courses_by_student();

void print_supervisor();

void print_grads_by_professor();