Thread: simple list and driver program help

this lil piece of code has been driving me nuts, it's just a simple list that can insert and remove strings into an array. please someone tell me where a stupid error is becuase i can't find it.

in case your wondering about the DEL declaration when i tried to set an element of myArray to NULL in teh removeString method it gave me an ambious overload error of =.

Code:

#ifndef LIST
#define LIST

#include <iostream>
#include <string>

using namespace std;

const int CAPACITY = 10;
typedef string ElementType;
const string DEL = NULL;
class List
{
 public:
   List();
   /*----------------------------------------------------------------------
     Construct a List object.

     Precondition:  None
     Postcondition: An empty List object has been constructed.
   -----------------------------------------------------------------------*/

   bool empty() const;
   /*----------------------------------------------------------------------
     Check if a list is empty.

     Precondition:  None
     Postcondition: true is returned if the list is empty, false if not.
   -----------------------------------------------------------------------*/

   int sizeOf() const;
   /*----------------------------------------------------------------------
     Find the number of items in a list.
#include "List.h"

using namespace std;

int main () {
	List myList;
	try {
	myList.insertString("DATA STRUCTURES");
	cout <<" 1 "<< endl;
	myList.insertString("CONSTRUCTORS");
	myList.insertString("DESTURCTORS");
	myList.insertString("TEMPLATES");
	myList.insertString("COPY CONSTRUCTOR");
	myList.insertString("EXPLICIT VALUE CONSTRUCTOR");
	myList.insertString("MEMORY LEAKS");
	myList.insertString("A QUICK BROWN FOX");
	myList.insertString("JUMPS OVER THE LAZY DOG");
	}
	catch (string error) {
		cout << error << endl;
	}
	cout << myList;
	return 0;
	}

     Precondition:  None
     Postcondition: returns the number of items in the list.
   -----------------------------------------------------------------------*/

   void insertString(ElementType item) throw (string);
   /*----------------------------------------------------------------------
     Insert an item into the list at a given position.

     Precondition:  item is the value to be inserted; there is room in
         the list; pos is >= 0 and <= sizeOf()the list.
     Postcondition: item has been inserted into the list at the position
         determined by pos (provided there is room and pos is a legal
         position).
   -----------------------------------------------------------------------*/

   void removeString(ElementType item) throw(string);
   /*----------------------------------------------------------------------
     Remove an item from the list at a given position.

     Precondition:  The list is not empty; pos is >= 0 and < sizeOf() the list.
     Postcondition: item at the position determined by pos has been
         removed (provided pos is a legal position).
   ----------------------------------------------------------------------*/

	friend std::ostream & operator << (std::ostream& out, const List & f);
	/*---------------------------------------------------------------
	Overloaded Output Operator.
		
	Precondition:	The ostream out is open.
	Postcondition:	The fraction represented by this Fraction
				object has been placed into out and reference
				to out is returned.
	---------------------------------------------------------------*/


 private:
   int mySize;                     // current size of list stored in myArray
   ElementType myArray[CAPACITY];  // array to store list items

}; //--- end of List class

#endif

Code:

#include "List.h"

using namespace std;

List::List(): mySize(0) {}

bool List::empty() const {
   return mySize == 0;
   }

int List::sizeOf() const {
   return mySize;
   }

void List::insertString(ElementType item) throw (string) {
	cout << "hi" << endl;
   string errorString;
   if (mySize == CAPACITY) {
      errorString = "The List capacity has been reached.  Cannot add new elements.";
      throw errorString;
   }
   int i = 0;
   while (item.size() > myArray[i].size()) {
	i ++;
	}
   for(int x = mySize; x > i; x --) {
	myArray[x+1] = myArray[x];
	}
   myArray[i] = item;
   mySize++;
}

void List::removeString(ElementType item) throw(string)
{
   string errorString;
   if (mySize == 0)
   {
     errorString = "The List is empty.  Cannot remove string.";
     throw errorString;
   }
   int i = 0;
   while (item.size() > myArray[i].size()) {
	i ++;
	}
   for(int x = i; x < mySize; x ++) {
       myArray[i] = myArray[i + 1];
	}
   myArray[mySize] = DEL;
    mySize--;
}

ostream & operator << (ostream & out, const List & temp)  {
	if (temp.mySize == 0) {
		out << "List is empty" << endl;
		}
	else {
		for (int x = 0 ; x < temp.mySize ; x ++) {
			out << (x + 1) << ")  " << temp.myArray[x] << endl;
			}
		}
	out << endl;
	return out;
	}

Code:

#include "List.h"

using namespace std;

int main () {
	List myList;
	try {
	myList.insertString("DATA STRUCTURES");
	cout <<" 1 "<< endl;
	myList.insertString("CONSTRUCTORS");
	myList.insertString("DESTURCTORS");
	myList.insertString("TEMPLATES");
	myList.insertString("COPY CONSTRUCTOR");
	myList.insertString("EXPLICIT VALUE CONSTRUCTOR");
	myList.insertString("MEMORY LEAKS");
	myList.insertString("A QUICK BROWN FOX");
	myList.insertString("JUMPS OVER THE LAZY DOG");
	}
	catch (string error) {
		cout << error << endl;
	}
	cout << myList;
	return 0;
	}

makefile if you need it

Code:

#specify the compiler
GXX=g++ -g

# Specifiy the target
all: ListDriver.exe

# Specify the object files that the target depends on
# Also specify the object files needed to create the executable
ListDriver.exe: ListDriver.o List.o 
	$(GXX)  ListDriver.o List.o -o ListDriver.exe

# Specify how the object files should be created from source files
ListDriver.o: ListDriver.cpp
	$(GXX)  -c  ListDriver.cpp

List.o: List.cpp
	$(GXX)  -c  List.cpp

# Specify the object files and executables that are generated
# and need to be removed to re-compile the whole thing
clean:
	rm -f *.o *~ core ListDriver.exe

when i compile on cygwin i get a core dump and on bash in debian it just aborts

What doe sthe following bit of code do?

Code:

   int i = 0;
   while (item.size() > myArray[i].size())
   {
       i++;
   }

if i is >= CAPACITY ?