Problem with double pointers

Question

can anyone tell me what is wrong with this piece of code

int* x=new int(5) ;
int i =0;
int** y = new int*[i];
for(int j = 0 ;j<5 ; j++)
{
     y[i++]=x;
}
delete[] y;

the compiler always triggers a breakpoint when I delete y note that I don't want to delete the object "x" thanks

Answer 1

int i =0;
int** y = new int*[i];

Well, you have just allocated an array of pointers to int that big enough to fit... zero elements. In your loop you are:

1. Writing outside the bounds of your array (remember, zero elements...)
2. Incrementing your loop counter twice for each iteration.
3. Never using your loop variable j.
4. Assigning the value of x to... every other element of y... that is outside the bounds of the array as previously mentioned.

I don't really know what you are trying to accomplish here. How about a bit more background? You are invoking undefined behavior by assigning outside the bounds of y, so anything can happen after that.