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CSY2002 Operating Systems
Task
This assignment (assignment 2) is worth 50% of the overall marks for the subject.
The following programs should be completed and documented and submitted as a portfolio, with the front sheet supplied filled in. The documentation supplied with each program is explained in the section labeled “How to Document Shell Scripts”, on page 3 of this document.
All the programs should be written in bash ( or similar e.g sh, korn) shell scripting language although it will be acceptable to embed some Python code (this should not exceed 15% of each program).
A brief outline of the 4 programs to write are outlined below :
- Write a script to prompt the user for two numbers, representing width and height of a rectangle in cm, and display the area of the rectangle both in square centimetres and in square inches. See page 10 for full brief.
- Personalise your bash prompt – this must be inserted into .bashrc or .bash_profile so that it is permanent. All assignments must show this prompt. See page 11 for full brief.
- Write a Linux Bash shell script to compute the bonus for a car salesperson. See page 12 for full brief.
- Write a shell script the play the card game Blackjack. See page 14 for full brief.
Style
Your shell script should be easy to read. This means that the flow of control should be obvious, the names of the variables descriptive and the design as simple as possible.
Proper style requires the use of consistent indentation and white space.
You should also ask yourself the following questions:
- Is your solution well designed?
- Did you complete one part of the task before starting another?
- Are your error messages and other output done consistently and are they understandable?
- Did you give the user sufficient information to readily correct the problem?
Calculating the area of a rectangle
1. Write a script to prompt a user for two numbers, representing width and height of a rectangle and to then calculate and display the value of the area of the rectangle.
a. The user should be prompted to input the data both in square centimetres and in square inches ( 1 inch = 2.54 cm).
b. The user should be prompted to display the area either in square metres and in square inches
c. The user should have the opportunity to either quit the program or input different data.
d. Extra marks will be awarded for well written programs and the use of dialogue boxes where appropriate.
e. Name this script “area.sh”.
Save these practical’s as they will be handed in as part of a portfolio.
Remember to use regular expressions for error checking. i.e when you prompt the user to enter a value you should test to see if it a number in the correct format. The format could be a floating point number (3.142) or an integer (12) – you should test for both.
You will need to use bc found in Topic 5 in the tutorial section, named More Shell Scripting (Tutorial 9). This deals with floating point mathematics and constructs including if – then – else loops, which you will need to revise.
When this is submitted as part of a portfolio you will need to include the following:
- Program code with comments
- Flowcharts
- User guide
- Description of how the code works
- Evidence of testing
- Screenshots of outputs – this should show your personalised prompt (this is covered in Topic 15 .
Personalised prompt
Personalise your bash prompt – this must be inserted into .bashrc or .bash_profile so that it is permanent. All assignments must show this prompt.
Bonus Scripting Problem
Write a Linux Bash shell script to compute the bonus for salespersons who are working at Mercedes Benz dealership who sell the following models:
A class – £24,095 – £38,095 (average £31,095)
B Class – £28,045 – £38,280 (average £33,162)
C Class – £34,670 – £50,405 (average £42,537)
E Class – £39,680 – £69,015 (average £54,437)
AMG C65 – £78,103 – £81,217 (average £31,095)
Each salesperson earns a basic salary of £2,000 per month. However:
- If he or she achieves £200,000 worth of sales they will earn a bonus of £1,000 per month.
- If he or she sells more than £300,000 worth of sales they will earn a bonus of £1,500 per month.
- If he or she sells more than £400,000 worth of sales they will earn a bonus of £2,000 per month.
- If he or she sells more than £500,000 worth of sales they will earn a bonus of £2,500 per month.
- If he or she sells more than £650,000 worth of sales they will earn a bonus of £3,000 per month.
Design a program which calculates, each salespersons salary per month.
Calculate the tax each salesperson pays and hence calculate their total salary after tax.
Inputs
- Enter Month
- Enter Salespersons name
- Models he/she sold
- Save the data
- File name
- File path
Outputs
- How to display results
- Name order
- Salary
- Name with associated net salary
The program should work for between 3 and 20 salespersons.
Sorting
You should employ a bubblesort (no marks will be awarded for the use of the bash sort command) to display a list of the SalesPersons. All inputs should be checked for valid data.
Tax Rates
Personal allowance- £12,500 – this is the amount you can earn before you start paying tax.
Basic Rate – £12,501 to £50,00 is taxed at 20%
Higher Rate- £50,001 to £150,000 is taxed at 40%
Save this practical as it will be handed in as part of a portfolio.
Remember to use regular expressions for error checking. i.e when you prompt the user to enter a value you should test to see if it a number/s or character/s are in the correct format.
When this is submitted as part of a portfolio you will need to include the following:
- Program code with comments
- Flowcharts
- User guide
- Description of how the code works – this is the implementation section (it is not a description of program when it is running).
- Evidence of testing
- Screenshots of outputs – this should show your personalised prompt (this is covered in Topic 15 .
- Objectives
Blackjack Program
Write a shell script to play the card game Blackjack. There must be one dealer and at least one player. Name the program blackjack.sh.
This is the final program which will be included in the portfolio.
To get the highest mark the game should be as close as possible to the game described below. You will need to:
- use arrays and
- determine how to ensure that a card which is dealt to one user is removed from the pack so that it is not available to other users.
- make the program user friendly.
Rules of the game
At the start of a blackjack game, the players and the dealer will receive two cards each. The players’ cards are normally dealt face up, while the dealer has one face down (called the hole card) and one face up.
The aim of the game is to accumulate a higher point total than the dealer, but without going over 21. You compute your score by adding the values of your individual cards.
The cards 2 through 10 have their face value, J, Q, and K are worth 10 points each, and the Ace is worth either 1 or 11 points (player’s choice).
The best possible blackjack hand is an opening deal of an ace with any ten-point card. This is called a “blackjack”, or a natural 21, and the player holding this automatically wins unless the dealer also has a blackjack. If a player and the dealer each have a blackjack, the result is a push for that player. If the dealer has a blackjack, all players not holding a blackjack lose.
After the cards have been dealt, the game goes on with each player taking action – in clockwise order starting to dealer’s left.
Each player can keep his hand as it is (stand) or take more cards from the deck (hit), one at a time, until either the player judges that the hand is strong enough to go up against the dealer’s hand and stands, or until it goes over 21, in which case the player immediately loses (busts).
In most places, players can take as many cards as they like, as long as they don’t bust (exceed 21).
When all players have finished their actions, either decided to stand or busted, the dealer turns over his hidden hole card.
If the dealer has a natural 21 (blackjack) with his two cards, he won’t take any more cards. All players lose, except players who also have a blackjack, in which case it is a push – the bet is returned to the player.
If the dealer doesn’t have a natural, he hits (takes more cards) or stands depending on the value of the hand. Contrary to the player, though, the dealer’s action is completely dictated by the rules. The dealer must hit if the value of the hand is lower than 17, otherwise the dealer will stand.
If the dealer goes bust, all players who are left in the game win. Otherwise players with higher point totals than the dealer win, while players with lower totals or equal to that of the dealer lose.
Players with a blackjack win a bet plus a bonus amount, which is normally equal to half their original wager. A blackjack hand beats any other hand, also those with a total value of 21 but with more cards.
As described above, if the dealer has a blackjack, players with blackjack make a push, while all other players lose.
A points system could be used to determine an overall winner of the game.
Definitions
Push is when you and the dealer have the same hand value. When this happens your bet will be returned. You don’t win anything and you don’t lose anything.
Bust – having a total over 21, resulting in an automatic loss
Hit – To ask for another card. If that extra card makes the total over 21, then the player busts
Stick or stand – To stop asking for more cards
Five card trick/Charlie – Reaching five cards in one hand without busting; although increasingly uncommon, casinos may offer a 2:1 bonus for achieving it.
Save these practical’s as they will be handed in as part of a portfolio on 24th April 2016.
When this is submitted as part of a portfolio you will need to include the following:
- Program code with comments
- Flowcharts
- User guide
- Description of how the code works
- Evidence of testing
- Screenshots of outputs – this should show your personalised prompt (this is covered in Topic 15 .
CSY2002 Operating Systems
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