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

1. 
   IntPtr p;
   int a[10];
   

   “a” points to a row of 10 boxes at right, each containing a question mark; “p” contains a question mark.

2. 
   for (index = 0; index < 10; index++)
   a[index] = index;
   

   Same as the diagram in (a), except the boxes at right contain the numbers 0 through 9 instead of question marks.

3. 
    p = a;
   

   Same as the diagram in (b), except “p” now also has an arrow pointing to the row of boxes instead of a question mark. A block of code below reads as follows:

   
   for (index=0; index < 10; index++)
      cout << p[index] << " ";
   

   The second line of this block is annotated “Iterating through p is the same as iterating through a”. Below is the line "Output 0 1 2 3 4 5 6 7 8 9".

4. 
   for (index = 0; index < 10; index++)
   p[index] = p[index] + 1;
   

   Same as the diagram in (c), except the row of boxes is numbered 1 through 10 instead of 0 through 9. A block of code below reads as follows:

   
   for (index=0; index < 10; index++)
   cout << a[index] << " ";
   

   The second line of this block is annotated “Iterating through a is the same as iterating through p”. Below is the line "Output 1 2 3 4 5 6 7 8 9 1 0".