Question

Library System Project The library at the University stores different items that can be borrowed, including books and journals. The library offers this service to a university members who include: students, staff and faculty members, but only faculty members can borrow journals. Students can borrow up to a maximum of 5 books and staff can bormow up to a maximum of 7 books, and faculty member can borow up to a maximum of 10 books and 3 journals. When a user borrows a book, they provide their Id, if this is valid their loan details are checked to ensure that they have not already borrowed above the maximum permitted number of books. The following is a brief class diagram that describes classes in this system and their relationships. Date Item month year SBN Libraryltem avalibaleCopies name email Book major work-phone author2 author3 Facu

Answer 1

The prgm below discusses the disk usage and login names of different users:

printf("total disk space of the partition: %ld MB \n",((stat.f_bsize)*(stat.f_blocks))/(1024*1024));
printf("total free disk space of the partition: %ld MB \n",((stat.f_bsize)*(stat.f_bfree))/(1024*1024));
printf("total used disk space of the partition: %ld MB \n",((stat.f_bsize)*(stat.f_blocks-stat.f_bfree))/(1024*1024));
break;

case 5:
fp=fopen("/etc/passwd","r");
printf("the login names of the connected users:\n ");
do
{
p=fgetpwent(fp);
if(p!=NULL)
{
printf("%s \n",p->pw_name);
count++;
}
else;
}while(p!=NULL);
printf("the number of connected users: %d \n",count);
break;