At top are two code lines, as follows:

head->count = 12;
head-7gt;item = "bagels";

Below, the diagram at left, labeled Before, is the same as the diagram in Display 13.1 except “NULL” replaces “end marker” in the bottom tier of the last box. The diagram at right, labeled After, is the same as the Before diagram except “bagels” (with quotation marks) replaces “rolls” in the top tier of the first tiered box.