C++

template <typename Comparable>
bool BinarySearchNode<Comparable>::remove( const Comparable & obj,
        BinarySearchNode<Comparable> * & ptr_to_this ) {
    if ( obj == element ) {
        if ( leaf() ) {                              // leaf node
            ptr_to_this = 0;
            delete this;
        } else if ( left() != 0 && right() != 0 ) {  // full node
            element = right() -> find_min();
            right() -> remove( element, right_tree );
        } else {                                     // only one child
            if ( left() != 0 ) {
                ptr_to_this = left();
            } else {
                ptr_to_this = right();
            }
            delete this;
        }

        return true;
    } else if ( obj < element ) {
       if ( left() == 0 ) {
           return false;
       } else {
           return left() -> remove( obj, left_tree );
       }
    } else {
       if ( right() == 0 ) {
           return false;
       } else {
           return right() -> remove( obj, right_tree );
       }
    }
}

please tell me how do take back the pointer at the beginning of the file...... i read a file once.... now i wanrt to read it again from starting so it is not workking. please help

#include <iostream.h>

using namespace std;
int main()
{
fstream fin;
char ch;
fin.open("abc.dat",ios::in||ios::binary);
if(!fin)
{
    cout<<"Error in opening the filen";
    exit(1);
}
while(!fin.eof())
{
   ch = fin.get();
   cout<<ch;
}
//again if you want to read the file from start
fin.seekg(ios:beg);
while(!fin.eof())
{
   ch = fin.get();
   cout<<ch;
}

//close the file stream
fin.close();
return 0;
}//end of main function