Все работает, кроме удаления последнего элемента. Подскажите пожалуйста, что не так?
| C++ |
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| #include <cstdlib>
#include <iostream>
using namespace std;
class dek
{
public:
char number[100];
dek* next;
dek* last;
};
void my_dek(const char*);
short action = -1;
dek* head = NULL;
dek* tail = NULL;
dek* lastPtr = NULL;
dek* ptrLast = NULL;
int i,j;
int add()
{
system("CLS");
dek* ptr = new dek;
cout<<"Vvedite danue: ";
cin>>ptr->number;
ptr->next = NULL;
if (head == 0)
{
head = ptr;
lastPtr = ptr;
system("CLS");
return 0;;
}
lastPtr->next = ptr;
lastPtr = ptr;
system("CLS");
return 0;;
}
int prosmotr()
{
{
system("CLS");
dek* ptr = NULL;
if (head == NULL)
{
cout<<"\n Dek pustoi\n\n";
system("PAUSE");
system("CLS");
return 0;
}
cout<<"dek:\n\n";
ptr = head;
while (1)
{
cout<<ptr->number<<" ";
if (ptr->next == 0)
break;
ptr = ptr->next;
}
cout<<"\n\n";
system("PAUSE");
system("CLS");
}
return 0;
}
int delhead()
{
system("CLS");
dek* ptrDelete = NULL;
if (head == NULL)
{
cout<<"\n Dek pustoi !!!\n\n";
system("PAUSE");
system("CLS");
return 0;
}
if (head->next == NULL)
{
head = NULL;
tail = NULL;
delete head;
}
ptrDelete = head;
head = ptrDelete->next;
head->last = NULL;
delete ptrDelete;
return 0;
}
int deltail()
{
system("CLS");
dek* ptrDelete = NULL;
if (tail == NULL)
{
cout<<"\n dek pustoi \n\n";
system("PAUSE");
system("CLS");
return 0;
}
if (tail->last == NULL)
{
head = NULL;
tail = NULL;
delete tail;
}
ptrDelete = tail;
tail = ptrDelete->last;
tail->next = NULL;
ptrLast = tail;
delete ptrDelete;
return 0;
}
int proverka()
{
dek* ptr = NULL;
system("CLS");
if (head == NULL)
{
cout<<"\n Dek pustoi !!!\n\n";
system("PAUSE");
system("CLS");
return 0;
}
if (head != NULL)
{
cout<<"\n Dek ne pustoi !!!\n\n";
system("PAUSE");
system("CLS");
return 0;
}
return 0;
}
int clean(){
head = NULL;
tail = NULL;
return 0;
}
int main()
{
setlocale(0,"Rus");
do
{
cout<<"1. Dobavit element\n";
cout<<"2. Prosmotr deka \n";
cout<<"3. Udalit pervui\n";
cout<<"4. Udalit posledniy element\n";
cout<<"5. Proverka nlichiya deka\n";
cout<<"6. Ochistit dek\n";
cout<<"0. Exit\n\n";
cout<<"Vash vubor: ";
cin>>action;
switch (action)
{
case 1: add(); break;
case 2: prosmotr(); break;
case 3: delhead(); break;
case 4: deltail(); break;
case 5: proverka(); break;
case 6: clean(); break;
case 0: return 0; break;
}
cout<<"1. Prodolzhut robotu\n";
cout<<"0. Exit\n";
cin>>action;
system("PAUSE");
system("CLS");
}
while (action!=0);
return 0;
} |
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