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course* sortByUnit(course* head)
{
course* newHead = 0;
course* oldHead = head;
while(oldHead)
{
course* a = oldHead;
oldHead = oldHead->next;
course* x, *prev;
for (x = newHead, prev = 0; x; prev = x, x = x->next)
{
if (a->units < x->units)
break;
}
a->next = x;
if (prev)
prev->next = a;
else
newHead = a;
}
return newHead;
}
course* sortByGrade(course* head)
{
course* newHead = 0;
course* oldHead = head;
while (oldHead)
{
course* a = oldHead;
oldHead = oldHead->next;
course* x, *prev;
for (x = newHead, prev = 0; x; prev = x, x = x->next)
{
if (tolower(a->grade) < tolower(x->grade))
break;
}
a->next = x;
if (prev)
prev->next = a;
else
newHead = a;
}
return newHead;
}
course* sortByDescription(course* head)
{
course* newHead = 0;
course* oldHead = head;
while (oldHead)
{
course* a = oldHead;
oldHead = oldHead->next;
course* x, *prev;
for (x = newHead, prev = 0; x; prev = x, x = x->next)
{
if (strcmp(a->className, x->className) < 0)
break;
}
a->next = x;
if (prev)
prev->next = a;
else
newHead = a;
}
return newHead;
}
course* sortByTerm(course* head)
{
course* newHead = 0;
course* oldHead = head;
while (oldHead)
{
course* a = oldHead;
oldHead = oldHead->next;
course* x, *prev;
for (x = newHead, prev = 0; x; prev = x, x = x->next)
{
if (courseCmp(a, x) < 0)
break;
}
a->next = x;
if (prev)
prev->next = a;
else
newHead = a;
}
return newHead;
}
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