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/* 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.");
}
}
/* 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.");
}
}