Homework Assignment #2

CS 161: Introduction to Computer Science 1

Submit your assignment to the D2L Dropbox (sign on via www.my.pdx.edu)

or Email your answers to: karlafgr@cs.pdx.edu

***Homework in CS161 consists of written homework and programming***

1. Create an Algorithm for turning in assignments using D2L’s dropbox. Write the algorithm in an outline form using complete sentences. Think of (a) how do you login, (b) how do get to the dropbox, (c) how do logout, etc.

· Assume you are writing the algorithm for someone who has never used D2L before

· Be careful not to skip any steps

· Desk check your algorithm (go through the algorithm as if you were turning in an assignment!)

2. Think about Style (i.e., how readable and/or maintainable a program is). Examine the program that was submitted for Homework #1. Think about what could be improved to make it more readable. Find 3 things that could be improved and write about them using complete sentences.

· Now, Rewrite the program improving upon the style – using your suggestions. Go overboard!

· Hint: you are looking for things that make the programs particularly easy to read.

3. Ethics. We have learned in lecture that ethics can involve messages that are displayed to the user that can have devastating results. Give an example of an unclear message you have encountered in the past. Explain what the message said and what it meant to you. Can you think of a better message that would have been clearer to you?

4. Programming. You have two choices for creating a program in homework #2. Only select one of the choices.

· Graphics: (If you are using Dev C++ and graphics.h then you can select this project)

Write a C++ program that draws widget, such as what we use in D2L. The program must use (a) lines, (b) circles or ellipses, and (c) text. For example, is one of the widgets in D2L. You can keep it simple. Try to have fun with it!

· Or, on Unix or for Mac users: (If you are using Unix or Linux then you can select this project)

Write a C++ program that calculates tips. This is like an application you might have on your phone or ipad where you enter in the cost, the percentage tip you would like to leave, and then the program will display the amount of money to leave as a tip. (Hint: This will be very similar to the inches to mm program in the slides, except that the math and inputs are different).

We will talk in class this week how to get the output formatted nicely when working with money. You will do this with cout statements. Try to have fun with this!!