Run-time error: Debug Assertion Failed when using Classes - debugging

Question

I am writing code for an assignment in my college C++ class, the program is meant to create a dynamically allocated array using a class. I am getting a debug assertion failed error when my objects go out of scope, because I am double deleting the pointer to the newly created array. I have no idea where this happens because I only use delete[] twice in the entire class. Here is my source:
#include
using namespace std;
//classes
class IntArray {
private:
int * begin;
int arrSize;
//returns true if n is a valid index inside the array
bool inBounds(int n) {
if (n < 0 || n >= arrSize) {
return false;
}
return true;
}
public:
//default constructor
IntArray() {
begin = new int[1];
begin[0] = 0;
arrSize = 1;
}
//call constructor
IntArray(int n) {
arrSize = n;
begin = new int[n];
for (int i = 0; i < n; i++) {
begin[i] = 0;
}
}
//copy constructor
IntArray(IntArray * in) {
arrSize = in->size();
begin = new int[arrSize];
for (int i = 0; i < arrSize; i++) {
begin[i] = in->begin[i];
}
}
//call constructor for arrays
IntArray(int in[],int s) {
arrSize = s;
begin = new int[arrSize];
for (int i = 0; i < arrSize; i++) {
begin[i] = in[i];
}
}
//method functions
//returns the size of the array
int size() {
return arrSize;
}
//returns the value of the element at position n
int get(int n) {
if (inBounds(n)) {
return begin[n];
}
cout << "Error: Invalid bound entered, returning value at index 0" << endl;
return begin[0];
}
//function that sets the value at position n to the value of input
void put(int n, int input) {
if (inBounds(n)) {
begin[n] = input;
}
else {
cout << "Error: invalid bound entered, no value changed" << endl;
}
}
//overloaded operators
//sets the value at the position n to input value
int & operator[](int n) {
if (inBounds(n)) {
return begin[n];
}
cout << "Error: invalid bound entered, returning index 0" << endl;
return begin[0];
}
//operator = allows copying of one IntArray to another
IntArray & operator=(IntArray source) {
arrSize = source.size();
delete[] begin;
begin = 0;
begin = new int[arrSize];
for (int i = 0; i < arrSize; i++) {
begin[i] = source[i];
}
return *this;
}
//destructor
~IntArray() {
//deallocate memory used by array
if (begin != 0) {
delete[] begin;
}
}
};
int main() {
IntArray arr1(10);
for (int i = 0; i < 10; i++) {
arr1[i] = 11 * i;
cout << arr1[i] << " ";
}
cout << endl;
for (int i = 0; i < 10; i++) {
cout << arr1.get(i) << " ";
}
cout << endl;
arr1.put(6, 16);
arr1.put(4, 10);
IntArray arr2(arr1);
IntArray arr3 = arr1;
for (int i = 0; i < 10; i++) {
cout << arr3.get(i) << " ";
}
cout << endl;
for (int i = 0; i < 10; i++) {
cout << arr2.get(i) << " ";
}
cout << endl;
system("PAUSE");
return 0;
}
And a screenshot of the exact error:

Answer 1

Thanks to #heavyd I realized that the error arose from an improper construction of the class due to a logic error in my class definition. The problem was in the way I was copying data to the new class (improperly) and the way that my copy constructor worked, as well as the return type of one of my member functions.