i have visual studio error debug assertion failed - c++

Question

In visual studio program crashes: error debug assertion failed. What is wrong in my code? There is no syntax errors. Only warning: deletion of array expression,conversion to pointer suplied When i run it with cmd standart compiler it works fine.
#include "stdafx.h"
#include <stdio.h>
#include <iostream>
using namespace std;
#define max_size 100
class my_array{
int* arr[max_size];
public:
my_array() {}
my_array(int size) {
if (size <= 0 || size > max_size) {
exit(1);
}
for (int i = 0; i < size; i++) {
arr[i] = new int;
cout << "Enter element [" << i + 1 << "] = ";
cin >> *arr[i];
}
}
~my_array() {
delete[] arr;
}
void operator[](int n) {
cout << endl;
for (int i = 0; i < n; i++) {
cout << "Enter element [" << i << "] = " << *arr[i] << endl;
}
}
};
int main() {
my_array array(6);
array[5];
return 0;
}

Answer 1

You are deleting arr here:
delete[] arr;
while arr has never been allocated by new. In your original program arr is a fixed size array of pointers to int.
You probably want this:
class my_array {
int *arr;
public:
my_array() {}
my_array(int size) {
if (size <= 0 || size > max_size) { // BTW this test isn't really necessary, as we
// can allocate as much memory as available
// anyway much more than just 100
exit(1);
}
arr = new int[size]; // allocate array of size size
for (int i = 0; i < size; i++) {
cout << "Enter element [" << i + 1 << "] = ";
cin >> arr[i];
}
}
~my_array() {
delete[] arr; // delete array allocated previously
}
void operator[](int n) {
cout << endl;
for (int i = 0; i < n; i++) {
cout << "Enter element [" << i << "] = " << arr[i] << endl;
}
}
};
Instead of having a fixed size array of pointers to int, you have a dynamic array of ints.
There is still room for improvement though. For example the my_array() constructor is pointless here, And it's odd to use the [] operator for printing the content, and the text "Enter element [" in the [] operator is also questionable.