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package algs13;
import java.text.DecimalFormat;
import stdlib.*;
public class Playground {
private Node first;
static class Node {
public double item;
public Node next;
public Node (double item, Node next) {
this.item = item;
this.next = next;
}
}
/* A silly main program to show list creation */
public static void main (String[] args) {
Trace.showObjectIdsRedundantly(true);
Trace.drawStepsOfMethod ("main");
//Trace.drawStepsOfMethod ("makeExample");
//Trace.drawSteps();
Trace.run ();
Playground example1 = Playground.makeExample (1);
Playground example2 = Playground.makeExample (5);
Playground example3 = Playground.makeExample (7);
Node x = example1.first;
StdOut.println (x.item);
}
public static Playground makeExample(int i) {
Node x1 = new Node (i+10, null);
Node x2 = new Node (i+20, null);
Node x3 = new Node (i+30, null);
Node x4 = new Node (i+40, null);
Playground result = new Playground ();
result.first = x1;
x1.next = x2;
x2.next = x3;
x3.next = x4;
return result;
}
public static void main2 (String[] args) {
//Trace.showObjectIdsRedundantly(true);
Trace.drawStepsOfMethod ("numFives");
Trace.drawStepsOfMethod ("numFivesH");
Trace.run ();
Playground list1 = Playground.from ("5 11 5 5");
Playground list2 = Playground.from ("24 35 67");
int result1 = list1.numFives ();
Trace.draw();
StdOut.println ("result: " + result1);
}
public int numFives () {
return StdRandom.uniform (100); //TODO: fix this
}
public static void main3 (String[] args) {
testNumFives (2, "11 5 5 21");
testNumFives (0, "11 21 31 41");
testNumFives (1, "11 21 5 31 41");
testNumFives (1, "5 11 21 31 41");
testNumFives (1, "11 21 31 41 5");
testNumFives (5, "5 11 21 5 5 31 5 41 5");
testNumFives (3, "5 5 5");
testNumFives (1, "5");
testNumFives (0, "11");
testNumFives (0, "");
StdOut.println ("Finished tests");
}
private static void testNumFives (int expected, String sList) {
Playground list = Playground.from (sList);
String sStart = list.toString ();
int actual = list.numFives ();
if (expected != actual) {
StdOut.format ("Failed: Expecting [%d] Actual [%d] with argument %s\n", expected, actual, list);
}
String sEnd = list.toString ();
if (! sStart.equals (sEnd)) {
StdOut.format ("Failed %s.numFives(): List changed to %s\n", sStart, sEnd);
}
}
/* ToString method to print */
public String toString () {
// Use DecimalFormat #.### rather than String.format 0.3f to leave off trailing zeroes
DecimalFormat format = new DecimalFormat ("#.###");
StringBuilder result = new StringBuilder ("[ ");
for (Node x = first; x != null; x = x.next) {
result.append (format.format (x.item));
result.append (" ");
}
result.append ("]");
return result.toString ();
}
/* Method to create lists */
public static Playground from(String s) {
Playground result = new Playground ();
if ("".equals (s)) return result;
Node first = null;
String[] nums = s.split (" ");
for (int i = nums.length-1; i >= 0; i--) {
try {
double num = Double.parseDouble (nums[i]);
first = new Node (num, first);
} catch (NumberFormatException e) {
throw new IllegalArgumentException (String.format ("Bad argument \"%s\": could not parse \"%s\" as a double", s, nums[i]));
}
}
result.first = first;
return result;
}
private static Playground of(double... items) {
Node next = null;
for (int i = items.length - 1; i >= 0; i--) {
next = new Node(items[i], next);
}
Playground result = new Playground();
result.first = next;
return result;
}
}
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