Thread: Missing something

I think I have been working on this too long.....in the Main Function area I can't get this to work, I am sure it is probably something simple but I am not seeing it, are you???
Thanks!!!!

Code:

 
#include <iostream.h>
#include <string.h>
//----------Node Class-------------//
class Digit {
     friend class NumberList;
 
public:
     Digit( const int & );
     int getData() const;
 
private:
     int data;
     Digit *nextPtr;
 
};
 
Digit::Digit( const int &info )
   : data( info ), 
     nextPtr( 0 ) 
{ 

}
 
int Digit::getData() const 
{ 
     return data;   
}

//-----------NumberList Class ------------------//
class NumberList{
 
public:
     NumberList();
     ~NumberList();
     void insertAtBack( const int & );
     bool isEmpty() const;
     void display() const;
     void HighInt();
     void LowInt();
     void AverageInt();
 
private:
     Digit *firstPtr;
     Digit *lastPtr;
 
     Digit *getNewNode( const int & ); 
};
 
NumberList::NumberList() 
   : firstPtr( 0 ), 
     lastPtr( 0 ) 
{ 

}
 
NumberList::~NumberList()
{
     if ( !isEmpty() ) {
          
 
          Digit *currentPtr = firstPtr;
          Digit *tempPtr;
 
          while ( currentPtr != 0 ) 
          {
               tempPtr = currentPtr;
               
               currentPtr = currentPtr->nextPtr;
               delete tempPtr;
          }
     }
     
}
 
void NumberList::insertAtBack( const int &value )
{
     Digit *newPtr = getNewNode( value );
 
     if ( isEmpty() )
          firstPtr = lastPtr = newPtr;
      else 
     {
          lastPtr->nextPtr = newPtr;
          lastPtr = newPtr; 
     } 
}
 
bool NumberList::isEmpty() const 
{ 
     return firstPtr == 0;   
}
 
Digit *NumberList::getNewNode( const int &value )
{
     return new Digit( value ); 
}
 
void NumberList::display() const
{
     if ( isEmpty() )
     {
          cout << "The list is empty\n\n";
          return; 
      }
 
      Digit *currentPtr = firstPtr;
 
     while ( currentPtr != 0 )
     {
          cout << currentPtr->data << " ";
          currentPtr = currentPtr->nextPtr;
    }
     cout << "\n\n";
}

void NumberList::AverageInt()
{
     if( isEmpty() )
     {cout << "The list is empty" << endl;}

     int length = 0;

     Digit *currentPtr = firstPtr;
     int sum = 0;

     while(currentPtr != 0)
     {
          length++;
          sum+=currentPtr->data;
          currentPtr = currentPtr->nextPtr;          
     }
     cout << "The average is " << (float)sum/length << endl;
}

void NumberList::HighInt()
{
     if( isEmpty() )
     {cout << "The list is empty" << endl;}

     Digit *currentPtr = firstPtr;

     int high = currentPtr->data;

     while(currentPtr != 0)
     {
          if(currentPtr->data > high)
          {high = currentPtr->data;}
          currentPtr = currentPtr->nextPtr;
     }
     cout << "The high is " << high << endl;
}

void NumberList::LowInt()
{
     if( isEmpty() )
     {cout << "The list is empty" << endl;}

     Digit *currentPtr = firstPtr;
     int low = currentPtr->data;

     while(currentPtr != 0)
     {
          if(currentPtr->data < low)
          {low = currentPtr->data;}
          currentPtr = currentPtr->nextPtr;
     }
     cout << "The low is " << low << endl;
}
 
//---------------main function---------------//
void main()
{
 int input;        
 int getInput(int *input);

     int n = 0;

    while(n != 9999)
    {
        cout << "Enter #" << n << " => ";
        cin >> input[i];
        if (input[i] == -1) break;
        i++;
    }

    return (n - 1);
}