(3)Explicit heap-dynamic variables: are nameless (abstract) memory cells that are allocated and deallocated by explicit directives, specified by the programmer, which take effect during execution

(3)Explicit heap-dynamic variables: are nameless (abstract) memory cells that are allocated and deallocated by explicit directives, specified by the programmer, which take effect during execution.

• Referenced only through pointers or references, e.g. dynamic objects in C++ (via new and delete), all objects in Java.
• C: int *intptr;

intptr = (int *) malloc(1 * sizeof(int));

free(intptr);

• Advantage: high flexibility (provides for dynamic storage management)
• Disadvantage: inefficient and unreliable.
• lifetime = from explicit allocation to explicit deallocation.