Для шаблонного класса List нужно создать метод, который поменяет местами максимальный и минимальный элемент в списке объектов класса CListDeleteFirstPositive.
| C++ |
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| using namespace std;
bool isDouble(string s) {
int m;
if (s.find('-') != -1) {
m = s.find('-');
if ((s.find('-', m + 1) != -1) || (m != 0)) {
return false;
}
}
if (s.find('.') != -1) {
m = s.find('.');
if ((s.find('.', m + 1) != -1) || (m == 0)) {
return false;
}
}
if (s.find_first_not_of("0123456789.-") != -1) {
return false;
}
}
class CListDeleteFirstPositive
{
struct list
{
int info;
struct list* next;
};
struct list* head;
struct list* tail;
public:
CListDeleteFirstPositive();
~CListDeleteFirstPositive();
void AddItem(int item);
void DisplayList();
void ReleaseList();
void DeleteFirstPositive();
friend istream& operator >> (istream& in, CListDeleteFirstPositive& l);
friend ostream& operator << (ostream& out, CListDeleteFirstPositive& l);
};
ostream& operator << (ostream& out, CListDeleteFirstPositive& l) {
l.DisplayList();
return out;
}
istream& operator >> (istream& in, CListDeleteFirstPositive& l) {
string temp;
double tx;
cin >> temp;
while (temp[0] != '.') {
stringstream ss;
ss << temp;
if ((ss.fail()) || (isDouble(temp) == false)) {
cout << "Ошибка ввода" << endl;
}
else {
ss >> tx;
l.AddItem(tx);
}
cin >> temp;
}
return in;
}
CListDeleteFirstPositive::CListDeleteFirstPositive()
{
head = NULL;
tail = NULL;
}
CListDeleteFirstPositive::~CListDeleteFirstPositive()
{
ReleaseList();
}
void CListDeleteFirstPositive::AddItem(int item)
{
struct list* newItem;
newItem = new struct list;
newItem->info = item;
if (tail == NULL)
{
head = newItem;
tail = newItem;
tail->next = NULL;
}
else
{
tail->next = newItem;
tail = tail->next;
tail->next = NULL;
}
}
void CListDeleteFirstPositive::DisplayList()
{
struct list* current = head;
while (current != NULL)
{
printf("->%d", current->info);
current = current->next;
}
}
void CListDeleteFirstPositive::ReleaseList()
{
if (head != NULL)
{
struct list* current;
while (head != NULL)
{
current = head;
head = head->next;
delete current;
}
head = NULL;
tail = NULL;
}
}
void CListDeleteFirstPositive::DeleteFirstPositive()
{
if (head != NULL)
{
struct list* current = head;
struct list* temp = NULL;
if (head->info > 0)
{
current = head;
head = current->next;
delete current;
printf("Первый положительный элемент удалён.");
}
else
{
while (temp == NULL && current != NULL)
{
if (current->next->info > 0)
{
temp = current;
}
current = current->next;
}
if (temp != NULL)
{
current = temp->next;
temp->next = current->next;
delete current;
printf("Первый положительный элемент удалён.");
}
else
printf("В списке нет положительных элементов.");
}
}
}
template <typename A>
class LIST {
struct spisok {
A* info;
spisok* next;
};
spisok* head, tail;
int count;
public:
LIST() {
head = NULL;
tail = NULL;
}
~LIST() {
DestrList();
}
void DestrList()
{
if (head != NULL)
{
struct list* current;
while (head != NULL)
{
current = head;
head = head->next;
delete current;
}
head = NULL;
tail = NULL;
}
}
void add(A* data) {
spisok* temp = new spisok;
temp->info = data;
temp->next = NULL;
if (head == NULL) {
head = temp;
tail = head;
}
else
{
tail->next = temp;
tail = tail->next;
}
count++;
}
void DisplayList() {
if (head == NULL) {
cout << "Список пуст" << endl;
}
else
{
spisok* temp = head;
while (temp) {
cout << *(temp->info);
if (temp->next != NULL)
cout << "=>";
else
cout << endl;
temp = temp->next;
}
}
}
void Change() {
if (head != NULL)
{
spisok* current = head;
spisok* max = head;
spisok* min = head;
while (current != NULL)
{
if (current->info > max->info)
{
max = current;
}
if (current->info < min->info)
{
min = current;
}
current = current->next;
}
spisok* temp = max;
max = min;
min = temp;
}
else {
cout << "Список пуст" << endl;
}
}
}; |
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