Description
Problem 1 (100 Points) In this problem you will test and analyze the Insertion, Heap, and Quick sort algorithms. To carry out his task, write a C++ program with the following requirements: 1. Analyze the algorithms by sorting, in ascending order, the BST, AVG, and WST arrays. Each one of these three arrays has 1000 integers where: a. BST has 1000 integers already sorted in ascending order (e.g., 10, 20, 30, …etc.). b. AVG has 1000 randomly generated integers, where each integer is between 0 and 100,000. c. WST has 1000 integers sorted in descending order (e.g., 1000, 990, 980, …etc.). Note: Make sure that all algorithms are tested with identical arrays. Therefore, at the beginning of your program, create three identical versions of the BST, AVG, and WST arrays where each algorithm sorts its own version. 2. Define two global integer variables: moves and comps. Initialize these variables to zero before every call to a sorting algorithm. Add any necessary code to the algorithms’ implementation to carry out the following: a. moves is incremented with each movement operation of the elements to be sorted (in this case they are the integer values in the arrays). Consider that the swap operation requires three movements of two elements. b. comps is incremented with each comparison operation on the elements to be sorted. c. After each call to the sorting algorithms functions ( 2 algorithms × 3 arrays = 6 calls), write to a text file, sort.txt, the values of moves and comps correspond to each algorithm. 3. After calling an algorithm function to sort an array, verify that the array is sorted. One way to do that is to confirm that every element i in the array has a value less than or equal to the value in element i+1 (write a function for this task and re‐check your code if it returns a false verification). 4. After running your program, copy the numbers in the text file, sort.txt, to an excel sheet. Use these numbers to generate two graphs. One graph compares the number of moves needed by the three algorithms for the three cases: best, average, and worst. Another graph does the same but for the number of comparisons performed by the algorithms. In your homework report, answer the following: i. Why does the Insertion sort algorithm result in zero moves when sorting an already sorted array (the best case)? ii. Why does the Insertion sort algorithm result in 999 comparisons when sorting an already sorted array (the best case)? iii. From your two excel graphs, comment on the performance of the sort algorithms under different scenarios (best, average, and worst). EECE7205 – Fall 2019 ‐ Homework 4 3 / 3 Programming Hints ‐ The following C++ code creates a text file and writes a text message in it: include #include #include using namespace std; int main() { ofstream outf; outf.open(“sort.txt”); if (outf.fail()) { cerr << “Error: Could not open output file\n”; exit(1); } outf << “\t\t Hello World \n”; outf.close(); //Close the file at the end of your program. return 0; } ‐ The following C++ code generates 5 random integers. Each integer is between 0 and 100. #include int main() { int A[5]; srand(time(NULL)); //call this only once at the beginning to // allow rand() to generate a different // succession of random values. for (int i = 0; i < 5 ; i++) A[i] = rand() % 100; return 0; }
