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#include <iostream>
using std::cout;
using std::endl;
using std::cin;
#include <iomanip>
using std::setw;
using std::setfill;
using std::left;
#include <list>
#include <fstream>
using std::fstream;
using std::ios;
void printgrid(class course*, int);
course* push_back(course*, course*);
int myStricmp(const char*, const char*);
int myStrincmp(const char*, const char*, size_t);
int courseCmp(const course*, const course*);
course* insert(course*, course*);
course* deleteHead(course*);
course* restoreList(course*);
void storeList(course*, int);
class course
{
public:
char cd[33]; // course designation
char term[7]; // term
int unit; // units
char grade; // grade
course* next; // link
course* prev; // backwards link
};
int main()
{
course* head = 0;
int z = 0;
int q = 0;
char restore;
cout << "\nDo you want to restore class list from previous run? [Y/N]" << endl;
cin >> restore;
if (restore == 'Y' || restore == 'y')
restoreList(head);
while (true)
{
int k = 0;
for (course* p = head; p; p = p->next)
{
printgrid(p, k);
k++;
}
char another;
cout << "\nDo you want to add a class? [Y/N]" << endl;
cin >> another;
if (another == 'y' || another == 'Y')
{
course* a = new course;
cout << "Enter the course description for the new entry. 32 char max [comsc-110]" << endl;
cin.ignore(1000, 10);
cin.getline(a->cd, 33);
cout << "Enter the term for the new entry. 6 char max [fa2001]" << endl;
cin.getline(a->term, 7);
cout << "Enter the number of units for the new entry [4]" << endl;
cin >> a->unit;
cout << "Enter the grade for the new entry [A]" << endl;
cin >> a->grade;
head = push_back(a, head);
}
if (another == 'n' || another == 'N')
{
int y = 0;
for (course* p = head; p; p = p->next)
{
printgrid(p, y);
y++;
}
for (course* p = head; p; p = p->next)
{
storeList(p, q);
q++;
}
while (head)
{
course* next = head->next;
delete head;
head = next;
}
break;
}
}
head = deleteHead(head);
return 0;
}
void printgrid(course* p, int x)
{
if (x == 0)
{
cout << "\nCOURSE TERM UNITS GRADE" << endl;
cout << "---------- ------ ----- -----" << endl;
}
cout << left << setw(12) << setfill(' ') << p->cd << setw(10) << p->term << setw(7) << p->unit << setw(6) << p->grade << endl;
}
course* push_front(course* a, course* h)
{
a->next = h;
return a;
}
course* push_back(course* t, course* h) // header
{
course* p, *prev;
for (p=h, prev=0; p; prev=p, p=p->next);
t->next = p; // p is zero
if (prev) // pointer to last node
prev->next = t;
else // empty list -- new node is 1st node
h = t;
return h;
}
course* deleteHead(course* h) // header
{
if (h) // zero if already empty list
{
course* next = h->next;
delete h;
h = next;
}
return h; // "h" is new head
}
int courseCmp(const course* a, const course* b)
{
//validate the length of the strings
if ((strlen(a->term) != 6) || (strlen(b->term) != 6))
return myStricmp(a->cd, b->cd);
//handle ties here
if (myStricmp(a->term, b->term) == 0)
return myStricmp(a->cd, b->cd);
// compare the years
int yearA = atoi(a->term + 2);
int yearB = atoi(b->term + 2);
if (yearA < yearB)
return -1; // termA comes first
if (yearA > yearB)
return 1; // termB comes first
// compare semesters in case of the same year
if (myStrincmp(a->term, "SP", 2) == 0)
return -1; // termA comes first
if (myStrincmp(b->term, "SU", 2) == 0)
return myStrincmp(b->term, "SP", 2) ? -1 : 1;
return 1;
}
int myStricmp(const char* dst, const char* src)
{
int f, l;
do
{
if (((f = (unsigned char)(*(dst++))) >= 'A') && (f <= 'Z')) f -= 'A' - 'a';
if (((l = (unsigned char)(*(src++))) >= 'A') && (l <= 'Z')) l -= 'A' - 'a';
} while (f && (f == l));
return(f - l);
}
int myStrincmp(const char* dst, const char* src, size_t count)
{
int f, l;
do
{
if (((f = (unsigned char)(*(dst++))) >= 'A') && (f <= 'Z')) f -= 'A' - 'a';
if (((l = (unsigned char)(*(src++))) >= 'A') && (l <= 'Z')) l -= 'A' - 'a';
} while (--count && f && (f == l));
return (f - l);
}
course* restoreList(course* head)
{
fstream fin;
fin.open("courses.dat", ios::binary|ios::in);
if (!fin)
return head;
// read the number of objects from the disk file
int nRecs;
fin.read((char*)&nRecs, sizeof(int));
// read the objects from the disk file
course* newHead = head; // the new list
for (int i = 0; i < nRecs; i++)
{
course* t = new course;
fin.read((char*)t, sizeof(course));
newHead = push_back(t, newHead);
}
fin.close();
return newHead;
}
void storeList(course* p, int x)
{
fstream fout;
fout.open("courses.dat", ios::out|ios::binary|ios::app);
fout.write((char*)&p->cd, sizeof(course));
fout.close();
}
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