Computer Science 215
                               Quiz O      Name ______________________

1. If a C program mallocs an area of memory and fails to free it,

   a. A garbage collector built         b. The OS will reclaim all of the
      into the C language will             memory used by the program including
      reclaim it                           unfreed malloc'd areas when
                                           the program exits.

   c. The memory will remain unusable   d. The memory will remain permanently
      until the system is rebooted         allocated and the computer will
                                           eventually have to be sent back to
                                           the factory for memory replacement

2. Suppose a buffer is declared as a local variable as follows:

   unsigned char buffer[512];

   The function that contains the declaration

   a. must include a free(buffer);      b. must NOT do free(buffer);
      to avoid a memory leak

   c. may do a free(buffer) but if
      it doesn't there will be no leak


3. Assuming "lst" points to the head a list of structures of type obj_t,
   best characterizes the following code fragment:

   obj_t *temp = malloc(sizeof(obj_t));
   temp = lst->head;

   a. it will cause a memory leak       b. it will cause a seg fault

   c. it is the correct way to
      set temp to point to the
      first object in the list.

4. Which would be the best way to reformulate the above code:

   a.  obj_t *temp = malloc(sizeof(obj_t));  b.   obj_t *temp = NULL;
       free(temp);                                temp = lst->head;
       temp = lst->head;

   c. The code was PERFECT as it was
      annd should be reformulated

5. What best describes this reformulation:

   obj_t *temp = malloc(sizeof(obj_t));
   free(temp);
   temp = lst->head;

   a. The call to free() will cause           b. Its mildly inefficient
      a seg fault.                               but won't cause any
                                                 major problem

   c. It creates a major memory leak