Question { 42963 }

What is dangling pointers?and what is memory leak?

Answer

A1 - Dangling pointer points to a memory location which is
being removed.
E.g.
int* a = new int;
int *b = a;
delete b;

Now a will be a dandling pointer.

A2 - Memory leaks occur when memory allocated to a pointer
is not deleted and the pointer goes out of scope. This
allocated memory never gets de-allocated and remains in the
heap until the system is restarted.
E.g.
void foo()
{
int* ptr = new int;
*ptr = 10;
...
...
}
Since ptr is allocated memory using 'new', but no 'delete'
is called, hence memory allocated to ptr will leak.