Due Date:

Midnight, Thursday May 15

Note: No late projects will be accepted.

Point Value:

This assignment is worth 80 points.

Objectives:

• To continue practicing using functions
• To practice using one-dimensional arrays
• To practice passing one-dimensional arrays between functions
• To experience having to understand someone else's code

Assignment:

Background

UMBC recently held a book fair. As an incentive to customers, they implemented the following discount scheme:

• the number of 5% discounts given,
• the number of 10% discounts given,
• the number of 15% discounts given,
• the smallest purchase made,
• the largest purchase made,
• the total cost of all books purchased before tax, and
• the total cost of all books purchased after tax (use a 5% tax rate).

The C Code

A file called proj7.c will provided for you. This file contains the function main and the #define directives you will need. Your job is to add the code for the function prototypes and the function definitions. Note that other than the addition of the prototypes and function definitions, you may not alter the given code in any way!.

You will need to copy the file proj7.c into your directory. To do this, go to the directory where you would like to store proj7.c. Then, use the following command to copy proj7.c into the directory:

The Input Data File

A data file containing all purchase amounts to use as input to your program will be provided. The last value in the file is -1.0. This is the sentinel value that signals the program to stop reading purchase amounts.

To use the data file as input to your program, you will use Linux redirection. By using redirection, you can tell Linux to read data from a file rather than from the keyboard. The scanf statement that you use in your program will look exactly the same as it would if you were getting your input from the keyboard. But since you will be getting the values from a file instead of from a user typing at the keyboard, you will not need to prompt the user.

When you run your program, use the following command:

You will need to copy the file proj7.dat into your directory. To do this, go to the directory where you would like to store proj7.dat. Then, use the following command to copy proj7.dat into the directory:

Other Notes

• To display an integer followed by a literal percent sign (%), use the format string "%d%%"
• To display two places after the decimal point, use the format string "%.2f"
• In Project 5, I had neglected to apply the discounts to the purchases before totaling them. I told the class to just do what I did. The same applies for this project.

Sample Program Run

Here is an example of what an input data file might look like:

Your program's output should follow this EXACT format. (The values will be different because the data file proj7.dat is different.)

Coding Standards:

Note that you MUST adhere to the coding standards and indentation style given on the Projects home page. So read them carefully and immediately!

Project Submission:

Submit your project by e-mailing your source code (proj7.c) to Gaurav (jolly1@umbc.edu) as attachments. Make the Subject of the e-mail Project 7 so that Gaurav knows what it is. Do NOT send your executable file (a.out) or the input data file (proj7.dat).

Thursday, 01-May-2003 21:42:28 EDT