C++

Time the sequential search and the binary search methods several times each for randomly generated values, then record the results in a table. Do not time individual searches, but groups of them. For example, time 100 searches together or 1,000 searches together. Compare the running times of these two search methods that are obtained during the experiment.

Regarding the efficiency of both search methods, what conclusion can be reached from this experiment? Both the table and your conclusions should be included in a separate Word document.

main.cpp

/********************************************

* Week 5 lesson: *

* ArrayList class with search algorithms *

*********************************************/

#include

#include "ArrayList.h"

#include

using namespace std;

/*

* Program to test the ArrayList class.

*/

int main()

{

srand((unsigned)time(0));

//list creation

ArrayList numbers;

for (int i = 0; i<20; i++)

{

numbers.add(rand()%100);

}

//printing the list

cout << "List of numbers:" << endl <<"\t";

numbers.display();

int x;

//searching with sequential search

cout << endl << "(Sequential Search) Enter a number: ";

cin >> x;

if (numbers.sequentialSearch(x)) cout << "Found!" << endl;

else cout << "Not found!" << endl;

//Sorting the list

numbers.quicksort();

cout << endl << "Sorted list of integers:" << endl <<"\t";

numbers.display();

//searching with sorted search

cout << endl << "(Sorted Search) Enter a number: ";

cin >> x;

if (numbers.sortedSearch(x)) cout << "Found!" << endl;

else cout << "Not found!" << endl;

//searching with binary search

cout << endl << "(Binary Search) Enter a number: ";

cin >> x;

if (numbers.binarySearch(x)) cout << "Found!" << endl;

else cout << "Not found!" << endl;

return 0;

}

ArrayList.cpp

/********************************************

* Week 5 lesson: *

* ArrayList class with search algorithms *

*********************************************/

#include

#include "ArrayList.h"

using namespace std;

/*

* Default constructor. Sets length to 0, initializing the list as an empty

* list. Default size of array is 20.

*/

ArrayList::ArrayList()

{

SIZE = 20;

list = new int[SIZE];

length = 0;

}

/*

* Destructor. Deallocates the dynamic array list.

*/

ArrayList::~ArrayList()

{

delete [] list;

list = NULL;

}

/*

* Determines whether the list is empty.

*

* Returns true if the list is empty, false otherwise.

*/

bool ArrayList::isEmpty()

{

return length == 0;

}

/*

* Prints the list elements.

*/

void ArrayList::display()

{

for (int i=0; i < length; i++)

cout << list[i] << " ";

cout << endl;

}

/*

* Adds the element x to the end of the list. List length is increased by 1.

*

* x: element to be added to the list

*/

void ArrayList::add(int x)

{

if (length == SIZE)

{

cout << "Insertion Error: list is full" << endl;

}

else

{

list[length] = x;

length++;

}

}

/*

* Removes the element at the given location from the list. List length is

* decreased by 1.

*

* pos: location of the item to be removed

*/

void ArrayList::removeAt(int pos)

{

if (pos < 0 || pos >= length)

{

cout << "Removal Error: invalid position" << endl;

}

else

{

for ( int i = pos; i < length - 1; i++ )

list[i] = list[i+1];

length--;

}

}

/*

* Bubble-sorts this ArrayList

*/

void ArrayList::bubbleSort()

{

for (int i = 0; i < length - 1; i++)

for (int j = 0; j < length - i - 1; j++)

if (list[j] > list[j + 1])

{

//swap list[j] and list[j+1]

int temp = list[j];

list[j] = list[j + 1];

list[j + 1] = temp;

}

}

/*

* Quick-sorts this ArrayList.

*/

void ArrayList::quicksort()

{

quicksort(0, length - 1);

}

/*

* Recursive quicksort algorithm.

*

* begin: initial index of sublist to be quick-sorted.

* end: last index of sublist to be quick-sorted.

*/

void ArrayList::quicksort(int begin, int end)

{

int temp;

int pivot = findPivotLocation(begin, end);

// swap list[pivot] and list[end]

temp = list[pivot];

list[pivot] = list[end];

list[end] = temp;

pivot = end;

int i = begin,

j = end - 1;

bool iterationCompleted = false;

while (!iterationCompleted)

{

while (list[i] < list[pivot])

i++;

while ((j >= 0) && (list[pivot] < list[j]))

j--;

if (i < j)

{

//swap list[i] and list[j]

temp = list[i];

list[i] = list[j];

list[j] = temp;

i++;

j--;

} else

iterationCompleted = true;

}

//swap list[i] and list[pivot]

temp = list[i];

list[i] = list[pivot];

list[pivot] = temp;

if (begin < i - 1)

quicksort(begin, i - 1);

if (i + 1 < end)

quicksort(i + 1, end);

}

/*

* Computes the pivot location.

*/

int ArrayList::findPivotLocation(int b, int e)

{

return (b + e) / 2;

}

/*

* Determines if an item exists in the array list using sequential (linear)

* search.

*

* x: item to be found.

*

* Returns true if x is found in the list, false otherwise.

*/

bool ArrayList::sequentialSearch(int x)

{

for (int i=0; i < length; i++)

if (list[i] == x)

return true; // x is in the array

return false; // x is not in the array

}

/*

* Determines if an item exists in the array list using sorted search.

* Precondition: list must be sorted.

*

* x: item to be found.

*

* Returns true if x is found in the list, false otherwise.

*/

bool ArrayList::sortedSearch(int x)

{

int i = 0;

while (i < length && list[i] < x)

i++;

if (i < length && list[i] == x)

return true; // x is in the array

else

return false; // x is not in the array

}

/*

* Determines if an item exists in the array list using binary search.

* Precondition: list must be sorted.

*

* x: item to be found.

*

* Returns true if x is found in the list, false otherwise.

*/

bool ArrayList::binarySearch(int x)

{

int first = 0, last = length - 1, pivot;

bool found = false;

while (first <= last && !found)

{

pivot = (first + last) / 2;

if (list[pivot] == x)

found = true;

else if (x < list[pivot])

last = pivot - 1;

else

first = pivot + 1;

}

if (found)

return true;

else

return false;

}

ArrayList.h

/********************************************

* Week 5 lesson: *

* ArrayList class with search algorithms *

*********************************************/

/*

* Class implementing an array based list. Sequential search, sorted search, and

* binary search algorithms are implemented also.

*/

class ArrayList

{

public:

ArrayList ();

~ArrayList();

bool isEmpty();

void display();

void add(int);

void removeAt(int);

void bubbleSort();

void quicksort();

bool sequentialSearch(int);

bool sortedSearch(int);

bool binarySearch(int);

private:

void quicksort(int, int);

int findPivotLocation(int, int);

int SIZE; //size of the array that stores the list items

int *list; //array to store the list items

int length; //amount of elements in the list

};