1.00/1.001 Introduction to Computers and Engineering Problem Solving Fall Final Exam


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1 1./1.1 Introduction to Computers nd Engineering Problem Solving Fll Finl Exm Nme: MIT Emil: TA: Section: You hve 3 hours to complete this exm. In ll questions, you should ssume tht ll necessry pckges hve lredy been imported. For coding questions, you do not need to include comments. You my only dd code inside the boxes. The code written outside the boxes my not be ltered in ny wy. Good luck! Question 1 / 1 Question 2 / 2 Question 3 / 2 Question 4 / 3 Question 5 / 2 Totl / 1 1./1.1  Fll Finl Exm 1 / 15
2 This pge is intentionlly left blnk. 1./1.1  Fll Finl Exm 2 / 15
3 Question 1 True/Flse Questions (1 points) Plese circle your nswer to the following questions. 1). A single strem cn be used s both n input strem nd n output strem t the sme time. True Flse 2). There cn be severl ctch blocks in single try/ctch structure. True Flse 3). A method cn throw more thn one type of Exception. True Flse 4). In Jv, clss cn extend ny number of bstrct clsses nd n bstrct clss cn hve ny number of subclsses. True Flse 5). Protected dt members cnnot be ccessed by other clsses in the sme pckge. True Flse 6). A finl method cnnot be overridden. True Flse 7). An event listener cn be registered with more thn one event source to receive notifictions bout specific types of events. True Flse 8). Strings re immutble (implicitly finl) in Jv. True Flse 9). When writing objects to file using ObjectOutputStrem, the objects cnnot hve methods. True Flse 1). A vrible declred inside for loop cn be referenced outside the loop. True Flse 1./1.1  Fll Finl Exm 3 / 15
4 Question 2 Dt Structures (2 points) 2. Drw links (lines with rrows) to illustrte the process of inserting node into linked list between node i nd node i+1. Use cross (X) to denote removing link. A step is line of code. Initilly New Node Node i Node i+1 After Step 1: New Node Node i Node i+1 After Step 2: New Node Node i Node i+1 2.b Which dt structure d is used in the following two opertions (dd() nd remove())? Plese circle your nswer: Stck Queue Arry ArryList 1 2 d.dd(3) d.remove() /1.1  Fll Finl Exm 4 / 15
5 2.c Drw the contents of the stck fter the following opertions re performed. (Show only the contents tht cn be referenced.) push( s ) push( e ) pop() push( e ) pop() pop() push( y ) push( ) pop() 2.d In the following SLinkedList clss, implement method public boolen clerrest(), which removes ll the nodes in the linked list beyond the first one. The method should return true if nodes were removed, nd flse if no nodes were removed. Mke sure first, lst nd length re set correctly. The linked list my be empty. public clss SLinkedList { privte int length = ; privte Node first = null; privte Node lst = null; //the first Node in the list //the lst Node in the list privte sttic clss Node { Object ; Node ; Node( Object o, Node n ) { = o; = n; // Other existing methods here... public boolen clerrest() { 1./1.1  Fll Finl Exm 5 / 15
6 Question 3 Mtrices (2 points) Recll clss Mtrix, s presented in lecture: public clss Mtrix { privte double[][] dt; public Mtrix(int m, int n) { dt = new double[m][n]; public int getnumrows() { return dt.length; public int getnumcols() { return dt[].length; public double getelement(int i, int j) { return dt[i][j]; // And mny other methods // End of Mtrix clss 1./1.1  Fll Finl Exm 6 / 15
7 3. Tridigonl mtrix. A tridigonl mtrix hs nonzero elements only in the min digonl, the first digonl below it, nd the first digonl bove it: n 1, n 2 n 2, n 1 n 1, n 1 Write method in clss Mtrix to check if the mtrix is tridigonl. All elements in the min digonl nd those immeditely bove nd below it must be nonzero. All other elements must be zero. Use tolernce of 115 to check if n element is zero or not. Assume the mtrix is squre; you do not hve to check. public boolen istridigonl() { 1./1.1  Fll Finl Exm 7 / 15
8 3.b Grph. A grph refers to collection of nodes nd collection of edges tht connect pirs of nodes. Grphs re used to model mny engineering problems, including communiction nd trnsporttion networks. Simple grphs cn be described by specil type of mtrix clled n djcency mtrix. An exmple grph is shown below. It contins 3 nodes, represented by circles with their index numbers in them. The network lso hs 3 edges between nodes; the edges llow flow in both directions. The mtrix on the right is the nodetonode djcency mtrix for the grph. Every entry ij refers to the edge between node i nd j, where ij = ji = 1 if the edge exists nd if it does not A = Imge by MIT OpenCourseWre. The nodetonode djcency mtrix of simple grph is squre nd symmetric. Ech edge is represented twice, once from i to j nd once from j to i. Node hs self loop in this exmple. The Grph clss is shown below; it is identicl to clss Mtrix except tht it holds ints, not doubles. public clss Grph { privte int[][] dt; public Grph(int n) { dt = new int[n][n]; public int getnumrows() { return dt.length; public int getnumcols() { return dt[].length; public int getelement(int i, int j) { return dt[i][j]; // And mny other methods, with ints rther thn doubles // End of Grph clss 1./1.1  Fll Finl Exm 8 / 15
9 Write method getnumedges(int j) for the Grph clss tht returns the totl number of edges connected to node j. For exmple, getnumedges(1) returns 2 for the grph bove. Your method should print n error messge nd return 1 if rgument j is invlid (out of rnge). public int getnumedges(int j) { 1./1.1  Fll Finl Exm 9 / 15
10 Question 4 Strems (3 points) You re given text file (registrtion.txt) tht contins lines of pirs of student IDs nd course nmes. 2381, , 8.1T 1812, , , , , 8.1T Ech line represents seprte instnce of student registrtion for prticulr course. The course is String; the student ID is n int. The delimiter is comm. You do not know the length of the file before you red ll of it. You re to write progrm tht: 1. reds the file, 2. counts the number of students registered in ech course, nd 3. prints list of ll courses with their enrollment to the console. In ddition: 1. Your progrm must hndle ny potentil exceptions. 2. Your progrm must use n pproprite dt structure to keep trck of the course registrtions, such s n rry list, hsh mp or tree mp. 3. You my write ll or most of your progrm in min() method in your clss, if you wish. You my use second clss, if necessry. Give your clss(es) descriptive nme(s). 4. You do not need to keep trck of the courses tht ech student tkes. You only need to compute nd output the number of students (enrollment) in ech course. 1./1.1  Fll Finl Exm 1 / 15
11 1./1.1  Fll Finl Exm 11 / 15
12 1./1.1  Fll Finl Exm 12 / 15
13 Question 5 Phidgets nd Trffic Control (2 points) As prt of reserch project, you will use Phidgets to implement vrious trffic signl control policies t 77 Msschusetts Ave. Currently, there re two signl phses: 1. Phse A: Green signl for trffic flowing on Msschusetts Ave. nd red light for pedestrin crossing 2. Phse B: Red signl for trffic flowing on Msschusetts Ave. nd green light for pedestrin crossing. For simplicity we mke the following ssumptions. 1. You do not need to consider the yellow light phse. 2. Signl phses A nd B lternte, with totl cycle time of 9 seconds nd cycle split of 2/3 for phse A nd 1/3 for phse B. Tht is, phse A is on for 6 seconds, then phse B is on for 3 seconds, nd so on 3. A push button for the pedestrin crossing will be dded. When the button is pushed during phse A nd the remining green time for trffic flowing on Msschusetts Ave. is more thn 3 seconds, pushing the button reduces tht green time remining to 3 seconds for the current A phse. 4. If the pedestrin button is pushed when there is less thn 3 seconds of green time remining in phse A, or in phse B, it hs no effect. 5. Phse A begins t time = in your progrm. 6. Assume the touch sensor genertes n event relibly. A touch sensor is connected to port on the input side of the Phidgets interfce bord. Four LEDs re connected to the output ports: LED Type Output Port Representing RED Red signl for pedestrins, phse A (don t wlk) GREEN 1 Green signl for trffic flow, phse A RED 2 Red signl for trffic flow, phse B GREEN 3 Green signl for pedestrins, phse B (wlk) Your tsk is to implement the signl system using Phidgets nd Jv. Red the code given below nd complete the two methods (questions 5 nd 5b) so tht your progrm works in ccordnce to the specifiction bove. The Timer tick triggers n ActionEvent every second (1 milliseconds). Hndle exceptions where needed nd print to console (System.out.println()) if exceptions occur during runtime. 1./1.1  Fll Finl Exm 13 / 15
14 public clss TrfficControl { /* Sttic members */ privte sttic InterfceKitPhidget interfcekit; privte sttic jvx.swing.timer tick; privte sttic int counter; // Counts up from seconds public sttic void min (String[] rgs) throws Exception { openintfckit(); tick = new jvx.swing.timer(1, new ActionListener(){ public void ctionperformed ( ActionEvent e ) { // Question 5: Complete the nonymous inner clss ); tick.strt(); // Code omitted to close the interfce kit. // End of min method // TrfficControl clss continues on pge 1./1.1  Fll Finl Exm 14 / 15
15 privte sttic void openintfckit() { try { interfcekit = new InterfceKitPhidget(); // Question 5b: Write the event hndler for touch sensor interfcekit.openany(); interfcekit.witforattchment(); interfcekit.setrtiometric(true); while (!interfcekit.getrtiometric()); ctch (PhidgetException pe) { System.err.println(pe); // End of openintfckit() method // End of Trffic Control clss 1./1.1  Fll Finl Exm 15 / 15
16 MIT OpenCourseWre 1. / 1.1 / 1.2 Introduction to Computers nd Engineering Problem Solving Spring 212 For informtion bout citing these mterils or our Terms of Use, visit:
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