I've been going through some tutorials and a book on C++ and in some, there is an interchange between the heap and free store terminology. One of them, however, says that they are not the same thing. It suggests that the free store is used in C++ and memory is allocated and freed using NEW and DELETE, whilst the heap is used in C and memory is allocated and freed using MALLOC and FREE. I am not familiar with the latter keywords as I have no experience of C, having decided to jump straight into C++.
Are the free store and heap interchangeable or are the distinctions mentioned above correct? If they are correct, I assume that keywords can't be mixed i.e. memory can't be allocated with MALLOC and freed with DELETE or allocated with NEW and freed with FREE?