On the function print() I get this error message below

[Bopaki]

I get this error when compiling my program:

Compiler: Default compiler
Executing  g++.exe...
g++.exe "C:\Dev-Cpp\newHeadInsert.cpp" -o "C:\Dev-Cpp\newHeadInsert.exe"    -I"C:\Dev-Cpp\lib\gcc\mingw32\3.4.2\include"  -I"C:\Dev-Cpp\include\c++\3.4.2\backward"  -I"C:\Dev-Cpp\include\c++\3.4.2\mingw32"  -I"C:\Dev-Cpp\include\c++\3.4.2"  -I"C:\Dev-Cpp\include"   -L"C:\Dev-Cpp\lib" 
C:\Dev-Cpp\newHeadInsert.cpp: In member function `void linkedList::print()':
C:\Dev-Cpp\newHeadInsert.cpp:38: error: expected primary-expression before ';' token

Execution terminated
 

  #include<iostream>
#include<list>
#include<cassert>
using namespace std;

struct Node
{
int data;
Node *link;
};
typedef Node *NodePtr, *head, *tmp;
class linkedList
{
public:
       void head_insert(NodePtr& head, int the_number);
       //Precondition: The pointer variable head points to
       //the head of a linked list.
       //Postcondition: A new node containing the_number
       //has been added at the head of the linked list.
       bool empty() const;
       void print();
};
void linkedList::head_insert(NodePtr& head, int the_number)
 {
 NodePtr temp_ptr;
 temp_ptr = new Node;

 temp_ptr->data = the_number;

 temp_ptr->link = head;
 head = temp_ptr;
 }

void linkedList::print()
{
//Display the nodes
NodePtr tmp;
     tmp = head;
          while(tmp)
          {
cout << tmp->data << " " <<endl;
     tmp = tmp->link;
}
}

 int main()
{
    linkedList list;
    NodePtr head, tmp, first;
    int num;
    list.head_insert(head, num);
    list.print();
    return 0;
}

[Thomas Huxhorn]

Please explain this line of code. I can not parse it in my head.

typedef Node *NodePtr, *head, *tmp;

[Bopaki]

It is exactly like that in the text book.

[Thomas Huxhorn]

But what does it mean? Is head a variable, or type or a pointer type?

[coder777]

Apart from that typedef, in print() line 38: head is not a variable to assign.

[ne555]

typedef Node *NodePtr, *head, *tmp;
//equivalent to
typedef Node *NodePtr;
typedef Node *head;
typedef Node *tmp;

they are all alias of a Node pointer.

> It is exactly like that in the text book.
quite an horrendous typo.
and given that `list' does not encapsulate `Node', perhaps quite an horrendous book too.

[Bopaki]

Thank you to all.
Problem now solved and works fine