I have an array with 6 elements, but when I try to access arr[6], it gives me a garbage value instead of array overflow error. What is the reason behind this?

#include

#include <bits/stdc++.h>

using namespace std;

int main()
{

int arr[] = {3, 2, 1, 56, 10000, 167};
cout << "Value: " << arr[6];

return 0;

}