” 写作CPT106编程、 辅导Software程序CPT106 Assessment 31CPT106 C++ Programming and Software Engineering IIAssessment 3Assessment Number 3Contribution to Overall Marks 35%Release Date Tuesday, 20-April-2021, 23:59Submission Deadline Wednesday, 5-May-2021, 23:59How the work should be submitted?SOFT COPY ONLY !(This is an INDIVIDUAL WORK and MUST be submitted through Learning Mall so that theTAs can run your programs during marking.)1. Make sure your name and ID are printed on the cover page of your report.2. A short report named with your Student ID number with up to a few pages in PDFformat should be submitted to Learning Mall.3. C++ source code files for all questions should be zipped into a single file namedwith your student ID number and submitted to Learning Mall.4. The report and zipped source code file should be submitted separately to twodifferent submission boxes on Learning Mall.5. Late Submission Policy: 5% of the total marks available for the assessment shall bededucted from the assessment mark for each working day after the submission date,up to a maximum of five working days.Assessment OverviewThis assessment aims at testing some basic concepts of C++ programming and initiates the routine ofcode development using the software development process (SDP). The report should include five mainsteps (step 1-5 below) of the software development process, and the marking criteria is as follows:1. Problem statement: formulate the problem. (10 marks)2. Analysis: determine the inputs, outputs, variables, classes, class relationships, etc. (10 marks)3. Design: use flow chart or UML activity diagram to define the main steps (the algorithm) neededto solve the problem. (10 marks)4. Implementation: the C++ code hasto be submitted as a zipped file. Just indicate here the name ofthe file.(40 marks, further divided in page 3)5. Testing: explain how you have tested and verified your C++ program and include some sampleruns of your C++ Programs. Testing result must be shown by screenshot and included in yourreport. (20 marks)6. The overall quality of report, including structure, writing, etc. (10 marks)CPT106 Assessment 32Line fitting algorithmsGiven a set of x,y data points, it is often necessary to automatically calculate an equationwhich gives the best fit line through the data. This type of analysis is known as line fittingor regression analysis.The mathematical basis behind line Fitting is quite straightforward. You have a set of datapoints represented by (x1,y1), (x2,y2) ….. (xn, yn). You want an equation which representsthis data, the exact type of equation will depend on the way in which the data varies. Givenany mathematical relationship between x and y it should be possible to generate a linefitting algorithm. The line fitting algorithm is described below.Straight lineThe equation for a straight line is: y = ax + b. Suppose that we have n points of (x,y) valuesfrom the text file, the values of a and b for the best fit line that is the best approximation ofthe given set of data points can be obtained from the following equation:is the difference between the two dotproducts (a1b2 – a2b1). It is easy to create a C++ program to calculate its value.DistanceThe distance from a point P(x,y) to the line ax+by+c=0 is the length of the perpendicularline from the point P to the line:Distance =|ax+by+c|2+2where (x,y) is the coordinate value for point P.Standard error of distance for all the points: SE= () 2=11Where is the mean Distance of all points, is the distance of Point Pi , n is the number of allpoints.CPT106 Assessment 33Please complete the assessment according to the following steps: (40 marks)1. Create a file operation class FileOp with functions as follows: (12 marks, 3 marks per question)a) It can allow users to input points from the keyboard and save these points into a text file.b) It can read points from the text file.c) It can delete a point from the text file.d) It can check if a point is in the text file.2. Create a class LineFitting with functions as follows: (15 marks, 3 marks per question)a) It can calculate the parameters of a, b and c for the best fit line ax+by+c=0.b) It can calculate the distance between each point in your file and the best fit line.c) It can find the best point from the file, which is not in the best fit line but has the minimaldistance compared to other points.d) It can find the worst point from the file, which has the maximal distance compared to otherpoints.e) It can calculate the standard error of distance for all the points.3. Create a main method in you program to achieve follow functions: (13 marks)a) Create a main method. (1 mark)b) Create a text file using the FileOp class with some points. (2 marks)c) Print out the equation of the best fit line (e.g. 3x+2y+3=0). (2 marks)d) Ask the user to input a Point and print out whether the point is in the text file or not, if it isin the file then print out its position. (2 marks)e) Print out the worst point that has a maximal distance to the best fit line in all the points. (2marks)f) Print out the standard error for all the points. (2 marks)g) Ask user to input a point and delete it from the File if the point exists in the text file. (2 marks)请加QQ：99515681 或邮箱：99515681@qq.com WX：codehelp
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