Требуется обнулить (проинициализировать) список стек при нажатии 5, помогите пожалуйста
| C++ |
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| #include <iostream>
#include <windows.h>
using namespace std;
class Course
{
public:
int number;
Course* last;
};
int main()
{
Course* ptrLast = NULL;
Course* top = NULL;
short action = 0;
while (1)
{
cout<<"1 - Add\n";
cout<<"2 - Delete\n";
cout<<"3 - Top\n";
cout<<"4 - Content\n";
cin>>action;
if (action == 1)
{
system("CLS");
int numb = -1;
cout<<"Input number: ";
cin>>numb;
Course* ptr = new Course;
ptr->number = numb;
if (top == NULL)
{
ptr->last = NULL;
top = ptr;
ptrLast = ptr;
system("CLS");
continue;
}
top = ptr;
ptr->last = ptrLast;
ptrLast = ptr;
system("CLS");
continue;
}
if (action == 2)
{
system("CLS");
Course* ptrDelete = NULL;
if (top == NULL)
{
cout<<"\t Empty \n\n";
system("PAUSE");
system("CLS");
continue;
}
ptrDelete = top;
cout<<"Deleted: \t";
cout<<top->number<<"\n\n";
if (ptrDelete->last == NULL)
{
top = NULL;
delete ptrDelete;
system("CLS");
continue;
}
top = ptrDelete->last;
ptrLast = top;
delete ptrDelete;
continue;
}
if (action == 3)
{
system("CLS");
if (top == NULL)
{
cout<<"\t Empty\n\n";
system("PAUSE");
system("CLS");
continue;
}
cout<<"Top: ";
cout<<top->number<<"\n\n";
system("PAUSE");
system("CLS");
continue;
}
if (action == 4)
{
system("CLS");
Course* ptr = NULL;
if (top == NULL)
{
cout<<"\t Empty\n\n";
system("PAUSE");
system("CLS");
continue;
}
cout<<"Content: \n";
ptr = top;
while (1)
{
cout<<ptr->number<<endl;
if (ptr->last == NULL)
{
system("PAUSE");
system("CLS");
break;
}
ptr = ptr->last;
}
}
if (action > 4)
{
system("CLS");
system("PAUSE");
system("CLS");
continue;
}
}
} |
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