display list forwad and backward

[doon]

void printForward( IntSLLNode head) {
       if (head!=0) {
           cout<<(head->info);
           printForward( head->next );
       }
     }
}

     void  printBackward( IntSLLNode head ) {
       if (head != 0) {
           printBackward( head->next );
           cout<<(head->info);
       }
     }

}

Write one recursive function (a member function of class intSLList discussed in chapter 17)
which displays the contents of a linked list forward then backward. Write a test drive main
program which creates a list object of class intSLList and adds elements to the list and then the
list object should call your function once.

there is an error tells that "base operand of -> has non pointer type IntSLLNode" and another error said that no match for operators != in head !=0 what is that mean please any help?

[ajh32]

It means that you have used a pointer indirection operator on a variable that isn't a pointer. Also, that the class or struct intSLList does not have a != operator but yet you have used one in your code.

[doon]

how to combine these two function in one function how its will be? is it will work?

[doon]

and how to test the function?

[doon]

#include <iostream>
#include "list.h"
using namespace std;
void printFB( int el,IntSLLNode *ptr);


void printFB( int el,IntSLLNode *ptr) {
       if (el!=0)
           {cout<<(ptr->info);
           printFB( el,ptr->next );}
           else
           if (ptr!=0)
          {
            printFB( el,ptr->next );
           cout<<(ptr->info);
       }
     }

int main()
{
    int el;
    IntSLLNode *ptr;
    cout <<"please Enter an Element"<<endl;
    cin>>el;
    printFB (el,ptr);



    return 0;
}

something wrong with my code?

[doon]

#include <iostream>
#include "list.h"
using namespace std;
void printFB( int el,IntSLLNode *ptr);


void printFB( int el,IntSLLNode *ptr) {
       if (el!=0)
           {cout<<(ptr->info);
           printFB( el,ptr->next );}
           else
           if (ptr!=0)
          {
            printFB( el,ptr->next );
           cout<<(ptr->info);
       }
     }

int main()
{
    int el;
    IntSLList L1;
    IntSLLNode *ptr;

   cout <<"please Enter an Element"<<endl;
    cin>>el;
    for(int i=0;i<10;i++)
        L1.addToTail(i);
    printFB (el,*ptr);

    return 0;
}

something wrong with the function call i guess m not really sure about how to test my function anyhelp?