Computer Science/61b/Homework/hw3/Homework3.java
< Computer Science | 61b | Homework | hw3(Redirected from CS/61b/Homework/hw3/Homework3.java)- This page contains computer code. Unlike all articles on the lensowiki, which are released under the GFDL, this code is released under the GPL.
Copyright 2006, 2007 Paul Borokhov. All rights reserved.
This code is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
The code is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
/* Homework3.java */
public class Homework3 {
/**
* smoosh() takes an array of ints. On completion the array contains
* the same numbers, but wherever the array had two or more consecutive
* duplicate numbers, they are replaced by one copy of the number. Hence,
* after smoosh() is done, no two consecutive numbers in the array are the
* same.
*
* Any unused elements at the end of the array are set to -1.
*
* For example, if the input array is [ 0 0 0 0 1 1 0 0 0 3 3 3 1 1 0 ],
* it reads [ 0 1 0 3 1 0 -1 -1 -1 -1 -1 -1 -1 -1 -1 ] after smoosh()
* completes.
*
* @param ints the input array.
**/
private static void smoosh(int[] ints) {
for (int i=0; i<ints.length-1; i++) {
while (ints[i] == ints[i+1] && ints[i] != -1) {
for (int ii=i; ii<ints.length-1; ii++) {
ints[ii] = ints[ii+1]; }
ints[ints.length-1] = -1;
} }
}
/**
* stringInts() converts an array of ints to a String.
* @return a String representation of the array.
**/
private static String stringInts(int[] ints) {
String s = "[ ";
for (int i = 0; i < ints.length; i++) {
s = s + Integer.toString(ints[i]) + " ";
}
return s + "]";
}
/**
* main() runs test cases on your smoosh and squish methods. Prints summary
* information on basic operations and halts with an error (and a stack
* trace) if any of the tests fail.
**/
public static void main(String[] args) {
String result;
int i;
System.out.println("Let's smoosh arrays!\n");
int[] test00 = {4, 4, 4};
System.out.println("smooshing " + stringInts(test00) + ":");
smoosh(test00);
result = stringInts(test00);
System.out.println(result);
int[] test0 = {1, 1, 1, 4};
System.out.println("smooshing " + stringInts(test0) + ":");
smoosh(test0);
result = stringInts(test0);
System.out.println(result);
int[] test1 = {3, 7, 7, 7, 4, 5, 5, 2, 0, 8, 8, 8, 8, 5};
System.out.println("smooshing " + stringInts(test1) + ":");
smoosh(test1);
result = stringInts(test1);
System.out.println(result);
TestHelper.verify(result.equals(
"[ 3 7 4 5 2 0 8 5 -1 -1 -1 -1 -1 -1 ]"),
"BAD SMOOSH!!! No cookie.");
int[] test2 = {6, 6, 6, 6, 6, 3, 6, 3, 6, 3, 3, 3, 3, 3, 3};
System.out.println("smooshing " + stringInts(test2) + ":");
smoosh(test2);
result = stringInts(test2);
System.out.println(result);
TestHelper.verify(result.equals(
"[ 6 3 6 3 6 3 -1 -1 -1 -1 -1 -1 -1 -1 -1 ]"),
"BAD SMOOSH!!! No cookie.");
int[] test3 = {4, 4, 4, 4, 4};
System.out.println("smooshing " + stringInts(test3) + ":");
smoosh(test3);
result = stringInts(test3);
System.out.println(result);
TestHelper.verify(result.equals("[ 4 -1 -1 -1 -1 ]"),
"BAD SMOOSH!!! No cookie.");
int[] test4 = {0, 1, 2, 3, 4, 5, 6};
System.out.println("smooshing " + stringInts(test4) + ":");
smoosh(test4);
result = stringInts(test4);
System.out.println(result);
TestHelper.verify(result.equals("[ 0 1 2 3 4 5 6 ]"),
"BAD SMOOSH!!! No cookie.");
System.out.println("\nLet's squish linked lists!\n");
int[] test5 = {3, 7, 7, 7, 4, 5, 5, 2, 0, 8, 8, 8, 8, 5};
SList list5 = new SList();
for (i = 0; i < test5.length; i++) {
list5.insertEnd(new Integer(test5[i]));
}
System.out.println("squishing " + list5.toString() + ":");
list5.squish();
result = list5.toString();
System.out.println(result);
TestHelper.verify(result.equals("[ 3 7 4 5 2 0 8 5 ]"),
"BAD SQUISH!!! No biscuit.");
int[] test6 = {6, 6, 6, 6, 6, 3, 6, 3, 6, 3, 3, 3, 3, 3, 3};
SList list6 = new SList();
for (i = 0; i < test6.length; i++) {
list6.insertEnd(new Integer(test6[i]));
}
System.out.println("squishing " + list6.toString() + ":");
list6.squish();
result = list6.toString();
System.out.println(result);
TestHelper.verify(result.equals("[ 6 3 6 3 6 3 ]"),
"BAD SQUISH!!! No biscuit.");
int[] test7 = {4, 4, 4, 4, 4};
SList list7 = new SList();
for (i = 0; i < test7.length; i++) {
list7.insertEnd(new Integer(test7[i]));
}
System.out.println("squishing " + list7.toString() + ":");
list7.squish();
result = list7.toString();
System.out.println(result);
TestHelper.verify(result.equals("[ 4 ]"),
"BAD SQUISH!!! No biscuit.");
int[] test8 = {0, 1, 2, 3, 4, 5, 6};
SList list8 = new SList();
for (i = 0; i < test8.length; i++) {
list8.insertEnd(new Integer(test8[i]));
}
System.out.println("squishing " + list8.toString() + ":");
list8.squish();
result = list8.toString();
System.out.println(result);
TestHelper.verify(result.equals("[ 0 1 2 3 4 5 6 ]"),
"BAD SQUISH!!! No biscuit.");
SList list9 = new SList();
System.out.println("squishing " + list9.toString() + ":");
list9.squish();
result = list9.toString();
System.out.println(result);
TestHelper.verify(result.equals("[ ]"),
"BAD SQUISH!!! No biscuit.");
System.out.println("\nLet's twin linked lists!\n");
System.out.println("twinning " + list6.toString() + ":");
list6.twin();
result = list6.toString();
System.out.println(result);
TestHelper.verify(result.equals(
"[ 6 6 3 3 6 6 3 3 6 6 3 3 ]"),
"BAD TWIN!!! No gravy.");
System.out.println("twinning " + list7.toString() + ":");
list7.twin();
result = list7.toString();
System.out.println(result);
TestHelper.verify(result.equals("[ 4 4 ]"),
"BAD TWIN!!! No gravy.");
System.out.println("twinning " + list9.toString() + ":");
list9.twin();
result = list9.toString();
System.out.println(result);
TestHelper.verify(result.equals("[ ]"),
"BAD TWIN!!! No gravy.");
}
}