辅导KIT107 Programming Assignment、讲解一个java计算器小

日期：2018-08-20 09:42

KIT107 Programming 2018

Assignment 1

Due Date

This assignment is to be completed in pairs. The assignment is due at 3PM

Wednesday August 15th 2018 and should be completed with a partner. You and your

partner should work together on all of the design and programming. It should be done

using the pair-programming methodology and not by division of labour.

Background

The local chocolate factory is going to try a curry flavoured dark chocolate. They

need to trial the amount of curry which they add so that the best flavour can be

determined. This concentration can range from no curry-all chocolate (represented

numerically as 0.0) up to all curry-no chocolate (represented numerically as 1.0).

Banana is often eaten with curry to reduce the ‘heat’ of the flavour. The chocolatier

plans to add very small banana pieces to the chocolate too. The amount needs to be

determined to match the curry and this will be trialled for a defined range too.

Modelling will be used to simulate the trials of different amounts of curry and banana

to optimise taste. To reduce cost, a ‘sweet spot’ of 500 Sweet Flavour Accents

(SweetFAs — the well-known international standard unit) has been set as the target.

Once a combination of curry, banana, and dark chocolate reaches/exceeds 500

SweetFAs the trial will conclude.

The food scientists have derived an equation for the tastiness of the chocolate:

Banana factor = 120 – number of banana pieces

Flavour = curry concentration * (800 – (banana factor * banana factor))

Program specification

You and your partner must write a Java program to calculate and display all possible

flavours for a range of banana pieces and curry concentrations.

First, your program should obtain the following information from the user:

? the minimum number of pieces of banana desired to be included;

? the maximum number of pieces of banana desired to be included; and

? a step size for the curry concentration

Once these values have been entered the program should check if the values entered

are legal (all positive, the minimum less than or equal to the maximum, and with the

difference between the minimum and maximum number of banana pieces not

exceeding 10).

If the values entered are not legal, the program should print an error message.

2/5

If the values entered are valid, the program should produce a table of results

displaying the flavour of the chocolate for each possible number of banana pieces in

the range specified by the user. Each column in the table should show the results for a

specific number of banana pieces, and should have this number displayed at the top of

the column. Each row in the table should show the results for a particular curry

concentration step, and should have that value displayed on the left to 2 decimal

places.

The first row should have a curry concentration equal to the step size given by the

user, and the curry concentration should increase by that step size for each subsequent

row. The program should keep adding rows to the table until either the curry

concentration reaches/exceeds 1.0, or until a chocolate bar is produced reaching the

threshold flavour of 500 SweetFAs.

All calculations of flavour should be done using doubles, and the results should be

displayed to 1 decimal place.

Your solution should run in Dr Java and comprise the following files:

? SweetFAInterface.java and SweetFA.java — the Flavour ADT.

You should have the following methods: a constructor, getters and setters for

the curry concentration object and number of banana pieces, and doer methods

to calculate the flavour, determine whether the flavour exceeds the threshold,

and convert the flavour to each of a double and a String.

? CurryInterface.java and Curry.java — the specification and

implementation (respectively) of a curry concentration. A curry concentration

should be implemented as a class with instance variables which consist of:

o the current curry concentration value (as a double); and

o the curry step value (as a double).

The class should also contain methods as specified in the interface, i.e. a

constructor, setter and getter for the step value, getter for the concentration

value, a doer which checks whether the concentration value is at the maximum

(and if so returns false, and if not increases the concentration value by the

step and returns true), and a method to convert the concentration value to a

String.

? AssigOne218.java — the file which contains the main() method.

A starting point is available on MyLO for you to download. You should complete all

of the required files.

Two example executions are shown below:

The Local Chocolate Factory

---------------------------

Enter the minimum number of banana pieces: 100

Enter the maximum number of banana pieces: 200

Enter the curry concentration step size: 0.14

Sorry, these are not legal.

3/5

The Local Chocolate Factory

---------------------------

Enter the minimum number of banana pieces: 102

Enter the maximum number of banana pieces: 109

Enter the curry concentration step size: 0.14

Number of banana pieces

Curry 102 103 104 105 106 107 108 109

0.14 66.6 71.5 76.2 80.5 84.6 88.3 91.8 95.1

0.28 133.3 143.1 152.3 161.0 169.1 176.7 183.7 190.1

0.42 199.9 214.6 228.5 241.5 253.7 265.0 275.5 285.2

0.56 266.6 286.2 304.6 322.0 338.2 353.4 367.4 380.2

0.70 333.2 357.7 380.8 402.5 422.8 441.7 459.2 475.3

0.84 399.8 429.2 457.0 483.0 507.4 530.0 551.0 570.4

Program Style

Your program should follow the following coding conventions:

? final variable identifiers should be used as much as possible, should be

written all in upper case and should be declared before all other variables

? variable identifiers should start with a lower case letter

? every if and if-else statement should have a block of code (i.e.

collections of lines surrounded by { and }) for both the if part and

the else part (if used)

? every do, for, and while loop should have a block of code (i.e. {}s)

? the keyword continue should not be used

? the keyword break should only be used as part of a switch statement

? opening and closing braces of a block should be aligned

? all code within a block should be aligned and indented 1 tab stop (or 4 spaces)

from the braces marking this block

? instance variables should be used sparingly with parameter lists used to pass

information in and out of functions

? local variables (excluding loop counters) should only be declared at the

beginning of methods (either as parameters or otherwise)

? commenting:

o There should be a block of header comment which includes at least

? file name

? student names

? student identity numbers

? a statement of the purpose of the program

? date

? the percentage of the work completed by the authors — 50:50

is expected and assumed but reasons should be given if it is

more/less than this

o Each variable declaration should be commented

o There should be comments that identify groups of statements that do

various parts of the task

o Comments should describe the strategy of the code and should not

simply translate the Java into English

4/5

Marking scheme

Task/Topic Maximum

mark

Program operates as specified

SweetFA.java correctly completed 6

Curry.java correctly completed 8

AssigOne218.java correctly completed 10

Program Style

Does not unnecessarily repeat tests or have other redundant/confusing code 3

Uses correctly the Java naming conventions 3

Alignment of code and use of white space makes code readable 3

Always uses blocks in branch and loop constructs 3

Meaningful identifiers 3

Header comments for the program (author, purpose, date, filename etc) 3

Each variable declaration is commented 3

Comments within the code indicate the purpose of sections of code (but DO NOT

just duplicate what the code says)

3

What and how to submit

What to submit

Paper submission

? A signed paper cover page (blanks can be collected from the Information and

Communications Technology Discipline office or from the ICT web site).

? A statement of the effort put in by each person. If this is missing, 50:50 will

be assumed.

? A print-out of the source code file for the program in landscape orientation.

Your assignment will not be fully marked unless this is present.

Electronic submission

? You should submit all .java files.

How to submit

Paper submission

? Firmly staple together all of the required documents (with the signed cover

page on top) and place them in the appropriate submissions box near the

Discipline of ICT Help Desk. Only one submission per pair is required.

Electronic submission

? Log in to MyLO and navigate to the Assignments tool under the

Assessments menu in the top tool bar.

? Select Assignment 1 from the list of available drop-boxes.

? Click on Add a File and follow the instructions to attach your source code

files and then click Add. Then click Submit. Only one submission per pair

is required.

5/5

If you want to re-submit, please just do so, for the paper submission write “Version 2”

etc on the documents.

Please note: only one paper and electronic submission is required for the pair.

Plagiarism and Cheating:

Practical assignments are used by the Discipline of ICT for students to both reinforce

and demonstrate their understanding of material which has been presented in class.

They have a role both for assessment and for learning. It is a requirement that work

you hand in for assessment is your own.

Working with others

One effective way to grasp principles and concepts is to discuss the issues with your

peers and/or friends. You are encouraged to do this. We also encourage you to discuss

aspects of practical assignments with others. However, once you have clarified the

principles of the question, you must express them in writing or electronically entirely

by yourself as a pair. In other words you and your partner must develop the algorithm

to solve the problem and write the program which implements this algorithm

yourselves. You can discuss the question, but not the solution. Assistance with the

solution should be provided by staff.

Cheating

? Cheating occurs if you claim work as your own when it is substantially the

work of someone else.

? Cheating is an offence under the Ordinance of Student Discipline within the

University. Furthermore, the ICT profession has ethical standards in which

cheating has no place.

? Cheating involves two or more parties.

o If you allow written work, program print-outs, or electronic versions of

your code to be viewed, borrowed, or copied by another student then

you are an equal partner in the act of cheating.

o You should be careful to ensure that your work is not left in a situation

where it may be used/stolen by others.

? Where there is a reasonable cause to believe that a case of cheating has

occurred, this will be brought to the attention of the unit lecturer. If the

lecturer considers that there is evidence of cheating, then no marks will be

given to any of the students involved and the case will be referred to the Head

of School for consideration of further action.

Julian Dermoudy, July 27th 2018.