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class LinkedList {
class Node { double item; Node next; }
Node first;
public double numFives1 () {
double result = 0;
Node current = first; // may be null
while (current != null) {
if (current.item == 5.0) result = result + 1;
current = current.next;
}
}
public double numFives2 () {
if (first == null) return 0;
double result = 0;
if (first.item == 5.0) result = 1;
Node prev = first; // never null
while (prev.next != null) {
if (prev.next.item == 5.0) result = result + 1;
prev = prev.next;
}
}
public double numFives3 () {
if (first == null) return 0;
double result = 0;
if (first.item == 5.0) result = 1;
Node prev = first; // never null
Node current = first.next; // may be null
while (current != null) {
if (current.item == 5.0) result = result + 1;
prev = prev.next;
current = current.next;
}
}
}
public static double numFives (double[] a) {
double result = 0;
int i = 0;
while (i<a.length) {
if (a[i] == 5.0) result = result + 1;
i = i + 1;
}
}
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