theres a problem with the code… unable to copy it… plz ignore the above code and try checking the code of pop function once again

void pop()
{
node *temp;
temp=s;
if( tos == -1 )
{
cout <p=NULL;
}
}

void pop()
{
node *temp;
temp=s;
if( tos == -1 )
{
cout <p=NULL;
}
}

struct node
{
int id, marks;
char grade, name[20], course[15];
struct node *next;
} *headnode = NULL, *tempnode, *startnode;
class student
{
public:
void add();
void pop();
void display();
};
void student::add()
{
system(“cls”);
int id, marks, totalmarks, m1, m2, m3, m4, m5, m6;
tempnode = new node;
if (headnode == NULL)
{
cout <> tempnode->id;
cout <> tempnode->name;
cout <> tempnode->course;
tempnode->next = NULL;
headnode = tempnode;
}
else
{
cout <> tempnode->id;
cout <> tempnode->name;
cout <> tempnode->course;
tempnode->next = headnode;
headnode = tempnode;
}
}

void student::display()
{
system(“cls”);
int item;
struct node *ptr = headnode;
int i = 1;
if (ptr == NULL)
cout << "\n list is empty.\n";
else
{
cout << "\n id\tname\tcourse\tGrade \n\n";
while (ptr != NULL)
{
cout << " " <id << " " <name << " ";
cout <course << " " <grade <next;
i++;
}
}
//system(“pause”);
}

void student::pop()
{
int item;
struct node *ptr;
if (headnode == NULL)
cout <id;
headnode = headnode->next;
free(ptr);

cout << "\n\n Item deleted:";
}
}
int main()
{
student sd;
system("cls");
int ch = 0;
//char ni[5];
while (ch != 7)
{
cout << "\n \t\t************STUDENT DATABASE************";
cout << "\n \t\t—————————————-";
cout << "\n\n \t\t\t 1.Push the Student Record \n\n \t\t\t 2.Pop Record";
cout << "\n\n \t\t\t 3.Display Records \n\n \t\t\t 0.Exit This Menu";
cout <> ch;
switch (ch)
{
case 1:
sd.add();
break;
case 2:
sd.pop();
break;
case 3:
sd.display();
break;
case 0:
exit(0);
}
}
getch();
return 0;
}