数组索引越界赋值的问题

我看过几篇类似的文章，但似乎没有一篇对我有帮助。如果有人能看看我的代码，告诉我我在这里做错了什么，我会很感激。我的老师帮不上什么忙。我在驱动程序中注释掉了第65 - 75行，因为我无法用这些来编译它，这也需要帮助

ArrayDriver.cpp

#include <iostream>
#include "myArray.h"
using namespace std;  
int main()
{ 
myArray<int> list1(5);
myArray<int> list2(5);
int i;
cout << "list1 : ";
for (i = 0 ; i < 5; i++)
    cout << list1[i] <<" ";
cout << endl;
cout << "Enter 5 integers: ";
for (i = 0 ; i < 5; i++)
    cin >> list1[i];
cout << endl;
cout << "After filling list1: ";
for (i = 0 ; i < 5; i++)
    cout << list1[i] <<" ";
cout<< endl;
list2 = list1;
cout << "list2 : ";
for (i = 0 ; i < 5; i++)
    cout << list2[i] <<" ";
cout<< endl;
cout << "Enter 3 elements: ";
for (i = 0; i < 3; i++)
    cin >> list1[i];
cout << endl;
cout << "First three elements of list1: ";
for (i = 0; i < 3; i++)
    cout << list1[i] << " ";
cout << endl;
myArray<int> list3(-2, 6);
cout << "list3: ";
for (i = -2 ; i < 6; i++)
    cout << list3[i] <<" ";
cout<< endl;
list3[-2] = 7;
list3[4] = 8;
list3[0] = 54;
list3[2] = list3[4] + list3[-2];
cout << "list3: ";
for (i = -2 ; i < 6; i++)
    cout << list3[i] <<" ";
cout<< endl;
/*
if (list1 == list2)
    cout << " list 1 is equal to list2 " << endl;
else
    cout << " list 1 is not equal to list2" << endl;
if (list1 != list2)
    cout << " list 1 is not equal to list2 " << endl;
else
    cout << " list 1 is equal to list2" << endl;
    */
//10% EXTRA CREDIT: UNCOMMENT CODE IF YOU'VE SUCCESSFULLY IMPLEMENTED THE FOLLOWING:
//cout << list1<< (list1 == list2 ? " is equal to" : " not equal to ") << list2 << endl;
//cout << list1<< (list1 != list2 ? " not equal to" : " is equal to ") << list2 << endl;
return 0;
}

myArray.h

#ifndef MYARRAY_H
#define MYARRAY_H
//#pragma once
#include <iostream>
//#include <assert.h>
//#include <iomanip>
//#include <string>
using namespace std;
template <class DataType>
class myArray
{
//overload for <<
//friend ostream& operator<<(ostream& out, myArray<DataType>& arr);
//overload for >>
friend istream& operator>>(istream& in, myArray<DataType>& arr);
public:
//myArray();
myArray(int size);
myArray(int start, int end);
//~myArray();
//overload []
DataType& operator[](int i);
//overload == operator
friend bool operator==(myArray<DataType> &arr1, myArray<DataType> &arr2);
//overload != operator
friend bool operator!=(myArray<DataType> &arr1, myArray<DataType> &arr2);
//overload = opertator
myArray<DataType> &operator=(const myArray<DataType> &rhs)
{
    if (myDataType != NULL)
        delete[]myDataType;
    myDataType = new DataType[rhs.arraySize];
    arraySize = rhs.arraySize;
    for (int i = 0; i < arraySize; i++)
        myDataType[i] = rhs.myDataType[i];
    return *this;
}
//function
void SetNULL();
protected:
int startIndex;
int endIndex;
int arraySize;
//template
DataType *myDataType;
};
#endif
template <class DataType>
DataType& myArray<DataType>::operator[](int i)
{
if (i > arraySize)
{
    cout << "Array out of bounds: " << endl;
}
else if (startIndex == 0)
{
    return myDataType[i];
}
else
{
    return myDataType[(startIndex + (i - 1))];
}
}
template <class DataType>
myArray<DataType>::myArray(int size) :
arraySize(size), startIndex(0), endIndex(size)
{
myDataType = new DataType[arraySize];
SetNULL();
}
template <class DataType>
myArray<DataType>::myArray(int start, int end) :
startIndex(start), endIndex(end)
{
if (start > end)
{
    cout << "Invalid start position: " << endl;
}
else
{
    arraySize = end - start;
}
myDataType = new DataType[arraySize];
SetNULL();
}
template <class DataType>
void myArray<DataType>::SetNULL()
{
for (int i = startIndex; i < endIndex; i++)
{
    myDataType[i] = (DataType)0;
}
}
//overload == operator
template <class DataType>
bool operator==(myArray<DataType> &arr1, myArray<DataType> &arr2)
{
bool testBool = true;
for (int i = 0; i < arraySize; i++)
{
    if (arr1[i] != arr2[i])
    {
        testBool = false;
    }
}
return testBool;
}
//overload != operator
template <class DataType>
bool operator!=(myArray<DataType> &arr1, myArray<DataType> &arr2)
{
bool testBool = true;
for (int i = 0; i < arraySize; i++)
{
    if (arr1[i] == arr2[i])
    {
        testBool = false;
    }
}
return testBool;
}
//overload >> operator
template <class DataType>
istream& operator>> (istream &in, myArray<DataType> &aList)
{
for (int i = 0; i < aList.arraySize; i++)
    in >> aList.list[i];
return in;
}