TEST(Test04, MembershipTests)
{
{
int x[100];
Set universal;
createEmptySet(&universal);
for (int i = 0; i < 100; i++)
{
insertSet(&universal, i);
x[i] = i;
}
Set s;
createCopySet(&s, &universal);
for (int i = 0; i < 50; i++)
{
/* choose a random element in array x */
int k = rand() % (100 - i);
int val = x[i];
/* remove that random value from x by copying the last element into position k */
x[k] = x[100 - i - 1];
ASSERT_TRUE(isMemberSet(&s, val));
removeSet(&s, val);
ASSERT_FALSE(isMemberSet(&s, val));
}
}
}
/*
* don't forget: it is OK to try to remove an element
* that is NOT in the set.
* If 'x' is not in the set 'self', then
* removeSet should do nothing (it's not an error)
* Otherwise, ('x' IS in the set), remove x. Be sure to update self->length
* It is not necessary (nor recommended) to call malloc -- if removing an element means the
* array on the heap is "too big", that's almost certainly OK, and reallocating a smaller array
* is almost definitely NOT worth the trouble
*
* My notes: if the set is empty, don't do anything because it's impossible to remove from a
* set with no members in it. If set is singleton, quicker to just do it manually.
*
* param self: set to remove element 'x,' assuming 'x' is in the set.
* param x: member to remove from set 'self'
* return: N/A
*/
void removeSet(Set* self, int x)
{
if ((!isMemberSet(self, x)) ||
(isEmptySet(self)) ||
(!isSorted(self)))
{
return;
}
if (self->len == 1) { /* easier to manually remove for a singleton set */
self->elements[0] = 0;
self->len = 0;
return;
}
int deleteHere = 0;
for (int index = 0; index < self->len; index++) { /* determine index where 'x' is within set */
if (self->elements[index] == x) {
deleteHere = index;
}
}
for (int index = deleteHere; index < self->len; index++) { /* O(N). */
if (index != (self->len - 1)) { /* don't want to write potentially random value to last member spot */
self->elements[index] = self->elements[index + 1]; /* shift every member to left one to update set members */
}
else {
self->elements[index] = 0; /* index reached last member spot. Make as empty spot */
}
}
self->len = self->len - 1; /* update length of set */
}
void isMemberTimeFun(void) {
if (isMemberSet(setA, is_mem_x)) {
is_mem_x ^= 1;
is_mem_x <<= 1;
} else {
is_mem_x >>= 1;
is_mem_x ^= 2;
}
}
/**
* add x as a new member to this set.
* If x is already a member, then self should not be changed
* Be sure to restore the design invariant property that elemnts[] remains sorted
* (yes, you can assume it is sorted when the function is called, that's what an invariant is all about).
*
* My notes: if the self 'self' isn't sorted, do nothing because you have an invalid input.
* If the set is empty, create large memory on heap so you don't have to worry about reallocation
* or changing number of members in set. Update length of set 'self.'
*
* param self: set that will have 'x' inserted into it.
* param x: member to insert into 'self,' assuming it is not already in 'self' and 'self' is sorted.
* return: N/A
*/
void insertSet(Set* self, int x)
{
if (isMemberSet(self, x) || (!isSorted(self))) { /* Don't insert element 'x' if 'x' is already in set */
return;
}
self->elements = (int*) realloc(self->elements, (self->len * sizeof(int)) + sizeof(int)); /* allocate the same amount of memory on heap + 1 */
int index = 0;
for (index = 0; index < self->len; index++) {
if (self->elements[index] > x) { /* correct index found for new member 'x.' */
for (int shiftIndex = self->len; shiftIndex > index; shiftIndex--) { /* start at the new largest index (+1 of the previous largest index) */
self->elements[shiftIndex] = self->elements[shiftIndex - 1]; /* shift the members to the right one */
}
break; /* exits the nearest while loop (i.e. the outermost loop here */
}
}
self->elements[index] = x; /* 'index' value holds index where 'x' should be inserted */
self->len = self->len + 1; /* update length of set 'self' */
}
/*
* create two sets with n random elements
* the sets should have 50% of the elements in common
*/
void createRandomSetN(int n, Set* a, Set* b) {
int x;
int last_size = 0;
createEmptySet(a);
while (a->len < n) {
if (a->len != last_size) {
last_size = a->len;
if (last_size % 1000 == 0) {
printf("%d..", last_size);
fflush(stdout);
}
}
x = 2 * (5 * n - (rand() % (10 * n)));
if (isMemberSet(a, x)) { continue; } // try another number
/* a will have only even elements */
insertSet(a, x);
if ((rand() % 2) == 0) {
insertSet(b, x);
} else {
insertSet(b, x + 1); // an odd value, can't be in a
}
}
assert(a->len == b->len);
}
void specialCaseTests(void) {
Set empty;
Set universal;
int i;
Set s;
Set r;
createEmptySet(&empty);
createEmptySet(&universal);
createEmptySet(&r);
for (i = 0; i < maximum_set_size; i += 1) {
insertSet(&universal, i);
}
checkCase(&subtractFromSet, &universal, &universal, &empty);
checkCase(&unionInSet, &universal, &universal, &universal);
checkCase(&intersectFromSet, &universal, &universal, &universal);
checkCase(&intersectFromSet, &universal, &empty, &empty);
checkCase(&intersectFromSet, &empty, &universal, &empty);
checkCase(&unionInSet, &universal, &empty, &universal);
checkCase(&unionInSet, &empty, &universal, &universal);
checkCase(&unionInSet, &empty, &empty, &empty);
checkCase(&subtractFromSet, &empty, &empty, &empty);
checkCase(&intersectFromSet, &empty, &empty, &empty);
createEmptySet(&s);
assert(isEmptySet(&s));
for (i = 0; i < 10; i += 1) {
insertSet(&s, i);
}
assert(s.len == 10);
for (i = 0; i < 10; i += 1) {
assert(isMemberSet(&s, i));
}
for (i = 0; i < 10; i += 1) {
removeSet(&s, i);
removeSet(&s, i);
assert(s.len == 9 - i);
}
assert(isEmptySet(&s));
for (i = 0; i < number_of_tests; i += 1) {
randomSet(&s);
assert(isSubsetOf(&empty, &s));
assert(!isSubsetOf(&s, &empty));
assert(isSubsetOf(&s, &universal));
assert(!isSubsetOf(&universal, &s));
checkCase(&intersectFromSet, &empty, &s, &empty);
checkCase(&intersectFromSet, &s, &empty, &empty);
checkCase(&intersectFromSet, &universal, &s, &s);
checkCase(&intersectFromSet, &s, &universal, &s);
checkCase(&unionInSet, &universal, &s, &universal);
checkCase(&unionInSet, &s, &universal, &universal);
checkCase(&subtractFromSet, &s, &empty, &s);
assignSet(&r, &universal);
subtractFromSet(&r, &s); // r = u - s;
checkCase(&subtractFromSet, &universal, &r, &s); // (u - (u - s) == s)
checkCase(&unionInSet, &s, &r, &universal); // s + (u - s) == u
checkCase(&unionInSet, &r, &s, &universal); // (u - s) + s == u
}
printf("The special case tests have been passed\n");
destroySet(&empty);
destroySet(&universal);
destroySet(&s);
destroySet(&r);
}
TEST(Test05, SpecialCaseTests)
{
{
Set empty;
Set universal;
Set s;
Set r;
int i;
createEmptySet(&empty);
createEmptySet(&universal);
createEmptySet(&r);
for (i = 0; i < MAX_SET_SIZE; i++)
{
insertSet(&universal, i);
}
ASSERT_TRUE(checkCaseNew(&subtractFromSet, &universal, &universal, &empty));
ASSERT_TRUE(checkCaseNew(&unionInSet, &universal, &universal, &universal));
ASSERT_TRUE(checkCaseNew(&intersectFromSet, &universal, &universal, &universal));
ASSERT_TRUE(checkCaseNew(&intersectFromSet, &universal, &empty, &empty));
ASSERT_TRUE(checkCaseNew(&intersectFromSet, &empty, &universal, &empty));
ASSERT_TRUE(checkCaseNew(&unionInSet, &universal, &empty, &universal));
ASSERT_TRUE(checkCaseNew(&unionInSet, &empty, &universal, &universal));
ASSERT_TRUE(checkCaseNew(&unionInSet, &empty, &empty, &empty));
ASSERT_TRUE(checkCaseNew(&subtractFromSet, &empty, &empty, &empty));
ASSERT_TRUE(checkCaseNew(&intersectFromSet, &empty, &empty, &empty));
createEmptySet(&s);
ASSERT_TRUE(isEmptySet(&s));
for (i = 0; i < 10; i++)
{
insertSet(&s, i);
}
ASSERT_TRUE(s.len == 10);
for (i = 0; i < 10; i++)
{
ASSERT_TRUE(isMemberSet(&s, i));
}
for (i = 0; i < 10; i++)
{
removeSet(&s, i);
removeSet(&s, i);
ASSERT_TRUE(s.len == 9 - i);
}
ASSERT_TRUE(isEmptySet(&s));
for (i = 0; i < NUM_TESTS; i++)
{
randomSet(&s);
ASSERT_TRUE(isSubsetOf(&empty, &s));
ASSERT_FALSE(isSubsetOf(&s, &empty));
ASSERT_TRUE(isSubsetOf(&s, &universal));
ASSERT_FALSE(isSubsetOf(&universal, &s));
ASSERT_TRUE(checkCaseNew(&intersectFromSet, &empty, &s, &empty));
ASSERT_TRUE(checkCaseNew(&intersectFromSet, &s, &empty, &empty));
ASSERT_TRUE(checkCaseNew(&intersectFromSet, &universal, &s, &s));
ASSERT_TRUE(checkCaseNew(&intersectFromSet, &s, &universal, &s));
ASSERT_TRUE(checkCaseNew(&unionInSet, &universal, &s, &universal));
ASSERT_TRUE(checkCaseNew(&unionInSet, &s, &universal, &universal));
ASSERT_TRUE(checkCaseNew(&subtractFromSet, &s, &empty, &s));
assignSet(&r, &universal);
subtractFromSet(&r, &s);
ASSERT_TRUE(checkCaseNew(&subtractFromSet, &universal, &r, &s));
ASSERT_TRUE(checkCaseNew(&unionInSet, &s, &r, &universal));
ASSERT_TRUE(checkCaseNew(&unionInSet, &r, &s, &universal));
}
destroySet(&empty);
destroySet(&universal);
destroySet(&s);
destroySet(&r);
}
}