In each diagram, a box labeled p1 is above a box labeled p2 at left. The variations for different lines of code are as follows:

1. int *p1, *0p2;

   p1 and p2 both contain a question mark.

2. p1 = new int;

   p1 points to a box at right containing a question mark; p2 contains a question mark.

3. *p1 = 42;

   Same diagram as (b), except the box at right contains the number 42 instead of a question mark.

4. p2 = p1;

   Same diagram as (c), except both p1 and p2 now point to the box with 42, with no question marks.

5. *p2 = 53;

   Same as diagram (d), except the box at right contains 53 instead of 42.

6. p1 = new int;

   p1 points to a box at right with a question mark; p2 points to another box at right with 53.

7. *p1 = 88;

   Same as diagram (f), except the box p1 points to contains 88 instead of a question mark.