The following is a partial definition of a LinkList class that represents a linked list of integer values. Three member

[answerhappygod]

The following is a partial definition of
a LinkList class that represents a linked list of integer
values. Three member functions are missing their definitions:
struct
Node
{
int data;
Node*
next;
};
class
LinkList
{
private:
Node*
first;
public:
LinkList() {first =
NULL;}
void add(int d);
int
pop();
void
display();
};
When the complete class is combined with the
following main, compiled, and run, an example of the output
generated is shown on the next page.
int main()
{
LinkList li;
int sel=1,n;
while (sel != 4)
{
cout << "\nMake a
selection:\n";
cout << "1 - Add a value to
the end of the list\n";
cout << "2 - Pop the front
value off the list\n";
cout << "3 - Display the
list\n";
cout << "4 - Exit the
program\n";
cout << "=> ";
cin >> sel;
switch (sel)
{
case 1:
cout << "\nEnter data value to add: ";
cin >> n;
li.add(n);
break;
case 2:
cout << "\nPopped front list value: " << li.pop()
<< endl;
break;
case 3:
li.display();
cout << endl;
break;
case 4:
cout << "\nExiting the program.\n";
break;
default:
cout << "\nInvalid selection - try again.\n";
break;
}
}
return 0;
}
Sample output (user input is shown in bold):
Make a selection:
1 - Add a value to the end of the list
2 - Pop the front value off the list
3 - Display the list
4 - Exit the program
=> 1
Enter data value to add: 222
Make a selection:
1 - Add a value to the end of the list
2 - Pop the front value off the list
3 - Display the list
4 - Exit the program
=> 1
Enter data value to add: 555
Make a selection:
1 - Add a value to the end of the list
2 - Pop the front value off the list
3 - Display the list
4 - Exit the program
=> 3
222
555
Make a selection:
1 - Add a value to the end of the list
2 - Pop the front value off the list
3 - Display the list
4 - Exit the program
=> 2
Popped front list value: 222
Make a selection:
1 - Add a value to the end of the list
2 - Pop the front value off the list
3 - Display the list
4 - Exit the program
=> 3
555
Make a selection:
1 - Add a value to the end of the list
2 - Pop the front value off the list
3 - Display the list
4 - Exit the program
=> 4
Write the definitions of the undefined member functions
on the next page. DON’T write the full program.