HW 1

Assignment #1

Due: Fri, Sept 16

Objectives

To practice with writing a small C++ main() program, along with compiling and running it
To practice with basic C++ input/output features, along with some simple decimal formatting
To practice with basic arithmetic operators in C++

Task

Create a program (Filename: paint.cpp) that will calculate the amount of paint needed to cover one side of a house with a sloped roof.

Assume that this side wall of the house is generally shaped as in the diagram below (with rectangular lower section, and triangular section where the roof slopes to a point) and that it contains one rectangular window, which does not get painted (obviously).
As you can see in the sample execution, you should ask the user for the dimensions of the wall (width, height to the bottom of the slanted roof, height up to the tip of the slanted roof) and the dimensions of the window (width and height) -- in this order. All of these dimensions should be of type double
Assume that a can of paint will cover 400 square feet of wall (make this a constant integer variable, so that it's simple to change this value in the program -- for example, to represent larger cans of paint in future versions).
After collecting all of the dimensions, your program should produce the output demonstrated in the sample execution. Also note that:
- The user-entered dimensions should be displayed in default format (only using a decimal point and digits to the right when needed)
- The paintable area should be displayed to 1 decimal place
- The required number of cans should be displayed to 2 decimal places
Write your program so that the output looks EXACTLY like the sample execution shown below (this means same wording, spacing, and formatting of numbers)
- Note: The underlining in the sample execution below is used to illustrate what the user is typing in -- obviously the underlining will not appear on the console.
You may assume that user input will be correct (i.e. numeric entries and valid dimensions)

General Requirements

No global variables
All input and output must be done with streams, using the library iostream
You may only use the iostream library (you do not need any others for these tasks)
Your program should only use standard ANSI header files (make sure to follow the directions exactly on the handout for creating Visual C++ projects, so that Windows-specific headers like stdafx.h and conio.h are not placed into your file)
When you write source code, it should be readable and well-documented.
Style Guidelines for Programs

Sample run 1: (user input underlined)

Welcome to Paint Calculator 2011!!

How wide is the wall (in feet)? 40
and how high is the wall to the bottom of the roof? 15.7
and how high is the wall to the top of the roof? 21.5
How wide is the window (in feet)? 3
and what is the window's height? 2.75

A side wall that is
  40' wide and
  15.7' tall to the roof bottom and
  21.5' tall to the roof top,
containing a window that is
  3' wide and
  2.75' tall,
has 735.8 square feet of paintable wall
and would require 1.84 cans of paint
(assuming that each can will cover 400 square feet of wall).

Thanks for using Paint Calculator 2011. Goodbye!!

Sample run 2: (user input underlined)

Welcome to Paint Calculator 2011!!

How wide is the wall (in feet)? 38.5
and how high is the wall to the bottom of the roof? 14.85
and how high is the wall to the top of the roof? 18.123
How wide is the window (in feet)? 2.75
and what is the window's height? 1.4   

A side wall that is
  38.5' wide and
  14.85' tall to the roof bottom and
  18.123' tall to the roof top,
containing a window that is
  2.75' wide and
  1.4' tall,
has 630.9 square feet of paintable wall
and would require 1.58 cans of paint
(assuming that each can will cover 400 square feet of wall).

Thanks for using Paint Calculator 2011. Goodbye!!

Compiling and Running:

This code only uses a standard library (iostream), so it will compile with any C++ compiler. Make sure you practice with MS Visual C++ 2010 Express Edition (and make sure it reports no compile errors!) before you submit the program.

Be sure to follow the instruction file on the course web page, on building console projects in Visual C++

Submitting:

Program submissions should be done through the submission web page, linked from the main course web site. You will need your submission password -- these were handed out in the first recitation class (May 17 - 21). If you missed class, see me or the TA who teaches your recitation section ASAP (or e-mail, if you can't come see me) to obtain your password. Do not send program submissions through e-mail -- e-mail attachments will not be accepted as valid submissions.

General Advice - always keep an untouched copy of your finished homework files on your computer science account. These files will have a time-stamp which will show when they were last worked on (a timestamp from the CS servers) and will serve as a backup in case you ever have legitimate problems with submitting files through the web site. Do this for ALL programs.