The pop() method from the Linked Stack class (Figure 6–11) stores the element being popped in a temporary variable result. Why doesn’t the pop() method from Array Stack (Figure 5–16) need to do this?...

The pop() method from the Linked Stack class (Figure 6–11) stores the element being popped in a temporary variable result. Why doesn’t the pop() method from Array Stack (Figure 5–16) need to do this?

Figure 6–11

Figure 5–16