EAS230: Programming for Engineers Lab 6 Fall 2004 Assigned: 12/1 Due: 12/10 Page 1 of 4 Lab6: Object-oriented Design and Array Data Structures Objective The objective of this lab is to learn to design and implement modular programs using functions: • Design solution using C++ classes, instantiate objects and invoke functions on the objects. • Use array data structures to store data. • Reinforce all the programming concepts learned in Labs 1- 5. Description For this lab, you will revisit the two (2) problems from Lab 5: 1. Projectile: Design a class Projectile with functions height and distance functions that compute the distance and height of a projectile as a function of time as specified in Lab 3. The initial velocity, initial height and launch angle will be specified as private data (properties) of the class Projectile. You will write another program with main function to test the Projectile class. 2. Stick Figure: Define and use three function drawTrianlgle, drawRectangle, and drawHollowRectangle to draw a stick figure as specified in Lab 3 and another fun figure of your choice using the same principles. Instead of printing out or saving the output in a file, the two figures will be saved in a two-dimensional array of characters and passed back to main program. After both figures have been captured into the array, it will be printed out and saved in an output file. We will use a combination of files, standard input (keyboard) and standard output (monitor screen). For each solution you will develop an algorithm, code the algorithm in C++, develop and test it in the Visual C++ environment. Visual C++ Environment A project in the VC++ environment is a program. A workspace is a folder in which all project-related information is stored. When you create a project you may create it in a new workspace or add it to an existing workspace. Refer to the handout “Working with VC++ programs” for more details. Do the following: 1. Create a workspace called Lab6. 2. Create a project for each program and add it to the Lab5 workspace. Create project names as follows: a. Projectile6 b. StickFigures6 Template for Program Header Place the following code at the beginning of every source code file that you submit for this class. /************************************************************** * NAME: your name * * PERSON NUMBER: your person number * * PROGRAM: Lab name * * PURPOSE: 1-2 line summary of the purpose of the lab * * DATE: Date of last update * * PLATFORM: Microsoft Visual C++ 6.0 Pro * * Course & Section: * **************************************************************/EAS230: Programming for Engineers Lab 6 Fall 2004 Assigned: 12/1 Due: 12/10 Page 2 of 4 On-line submission of your code All source code (.cpp) and data files created by you and generated by the programs that you implement will need to be submitted using the on-line command which is available on-line on the course website (www.cse.buffalo.edu/~terrill/eas230). A summary of the procedure for submission is as follows: For example, from your command-prompt, do the following: • ssh unix.eng.buffalo.edu o enter your username and password • Change directories to where your files are located as shown in the example below, o cd ~/eas230/Lab6/Projectile6 • Run the following command for each file o submit_eas230 <file> § where <file> is the name of the file you need to submit. Problem 1: Projectile Functions 60% We will modify the projectile problem solved in Lab 3 to design and implement a class Projectile that encapsulates the properties and operations (functions) associated with a projectile. • You will implement the class using a header file and a corresponding source: Projectile.h and Projectile.cpp • Projectile.h will include the private data and the function to operate on the data. • Some of the functions are as given below: Projectile(double angle, double height, double velocity); // constructor double distance (double time); double height (double time); • Projectile.cpp will include the definition of the function specified in the Projectile.h • To test the class Projectile, you will write an application ProjectileTester.cpp that will instantiate an object happyObj of class Projectile and test its functions. • You will input values of alpha (in degrees), v0 and z0 from standard input (keyboard) and initialize the happyObj. • The main function will call the object’s functions for computing height and distance for various time values. It is good programming style to do all the input/output from the main function. • For each input set, the program will compute a set of r(t) and z(t) and output to the screen as well as to an output file “Plot6.out”. It will have three columns time, distance and height. Each set of output will have heading that shows the angle of launch. A sample data set is shown below: Projectile Motion with launch angle 15 degrees. Time Distance Height ……………………………........ 0.3 1.88356 10.5632 0.31 1.94634 10.5501 0.32 2.00913 10.5361 0.33 2.07191 10.521 ……………………………........ Projectile Motion with launch angle 30 degrees. Time Distance Height ……………………………........ 0.53 2.98346 10.8447 0.54 3.03975 10.8247 0.55 3.09604 10.8037 0.56 3.15233 10.7818 ………………………………….. The projectile problem from Labs 3 and 4 is repeated below for your reference:EAS230: Programming for Engineers Lab 6 Fall 2004 Assigned: 12/1 Due: 12/10 Page 3 of 4 This problem deals with equations dealing with motion of objects in two dimensions. In particular we will look at projectile motion as discussed in the web resource: http://www.glenbrook.k12.il.us/gbssci/phys/Class/vectors/u3l2b.html. We are interested in the height and distance of the projectile with reference to time. The formulae for these two are readily available at another web resource: http://www.egwald.com/geometry/projectile3d.php and are repeated below. Assume that the projectile is fired from a gun that is mounted on a cliff above the sea. z0 = height of the gun above the x-y plane in meters. v0 = muzzle velocity = initial velocity of the projectile in meters/sec. alpha = the angle between