What condition indicates that a linked list is empty? Modify the function in Figure 8.19 so that it stops printing once a particular name has been printed. Based on the technique of this section for...

What condition indicates that a linked list is empty? Modify the function in Figure 8.19 so that it stops printing once a particular name has been printed. Based on the technique of this section for implementing a stack in a contiguous block of cells, what condition indicates that the stack is empty?