error C2228: left of '.*' must have class/struct/union

[sbsbsb]

The following is source code from my professor. It generates 4 C2228 errors at the bolded places below. I've browsed the forum, but any help or a link to another similar question would be appreciated-- thank you.

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

//myString.txt file is in the same folder with the following:
//apple orange grape kiwi banana pineapple grapefruit duran

class Node{
public:
//Constructors
Node();
Node(string st);
Node(Node *);

//get functions
string getValue();
Node * getNext();

//set functions
void setValue(string v);
void setNext(Node * nx);

//Utility functions
void print();

private:
string value;
Node * next;
};

class LinkedList{
public:
//Constructors
LinkedList();
LinkedList(Node * nd);

//Destructor
~LinkedList();

//public functions
void print();
void add(Node * nd);
void reverse();
private:
Node * first; //Pointer to the first node of the list
};


//Global function
void buildList(LinkedList * ls)
{
ifstream inData;
inData.open("myStrings.txt");

string st;
Node * nd;

inData >> st;
while(inData)
{
nd = new Node(st);
ls.add(nd);
//error C2228: left of '.add' must have class/struct/union
inData >> st;
}
}

int main()
{
//Create an object of LinkedList
LinkedList * lst = new LinkedList();

//Build a linked list
buildList(lst);

//Print the list
lst.print();
//error C2228: left of '.print' must have class/struct/union

//Revese it
lst.reverse();
//error C2228: left of '.reverse' must have class/struct/union

//Print it again and check if it is reversed.
lst.print();
//error C2228: left of '.print' must have class/struct/union

return 0;
}

[shacktar]

Replace ls. or lst. with ls-> or lst-> respectively. Those errors are showing up because ls/lst is a pointer to a LinkedList and the dot operator is only for non pointer class/struct/union instances. The -> is the same as doing a dereference followed by an access. Let's say you have LinkedList* lst. Then lst->print() is the same thing as (*lst).print().

[sbsbsb]

Thank you so very much! Now to start work on the actual project.