Fractions Calculator

Fractions program for Object Oriented Programming Evaluatie 3

FractionsDemo.mp4

This is a demo of the WPF Fraction calculator.

Table of Contents
Author
Assignement
Fractions Library
- Installation
- Usage
- UML Diagram
Console Application
WPF Application
xUnit Tests
Future Improvements

Author

This application was created by Simon Stijnen. Student at Vives University Of Applied Sciences. Studying Electronics - ICT.

Assignement

This project is the 3rd assignment for the Object Oriented Programming course. The assignment details can be found in the assignment PDF.

Fractions Library

The Fractions library is a simple library that allows you to perform basic arithmetic operations on fractions. The library provides a Fraction class that represents a fraction with a numerator and a denominator. The Fraction class provides methods to add, subtract, multiply, and divide fractions, as well as methods to simplify and invert fractions.

Installation

To run this application you need to have the .NET 6.0 SDK and Visual Studio installed on your machine.

The FractionsLibrary is also published to NuGet. You can install it using the following command:

dotnet add package SimonStnnFractions

For more installation options, please refer to the NuGet package page.

Usage

To use the library in your project, add the following using directive to your code:

using FractionsLibrary;

You can then create a new Fraction object and perform arithmetic operations on it:

Here is an example of how to use the Fractions library:

Fraction a = new Fraction(1, 2);
Fraction b = new Fraction(1, 3);

Fraction c = a.Add(b);
Fraction d = a.Subtract(b);
Fraction e = a.Multiply(b);
Fraction f = a.Divide(b);

Console.WriteLine($"a = {a}");     // Output: a = 1/2
Console.WriteLine($"b = {b}");     // Output: b = 1/3
Console.WriteLine($"a + b = {c}"); // Output: a + b = 5/6
Console.WriteLine($"a - b = {d}"); // Output: a - b = 1/6
Console.WriteLine($"a * b = {e}"); // Output: a * b = 1/6
Console.WriteLine($"a / b = {f}"); // Output: a / b = 3/2

UML Diagram

classDiagram
class Fraction{
    - _numerator: int
    - _denominator: int
    + << get/set >> Numerator: int
    + << get/set >> Denominator: int
    + Fraction()
    + Fraction(int numerator, int denominator)
    + Add(right: Fraction) Fraction
    + Subtract(right: Fraction) Fraction
    + Multiply(right: Fraction) Fraction
    + Divide(right: Fraction) Fraction
    + Reciprocal() Fraction
    + Invert() Fraction
    + Simplify() Fraction
    + Result() double
    + ToString() string
}

Atributes

_numerator: The numerator of the fraction.
_denominator: The denominator of the fraction.

Properties

Numerator: The property to get and set the numerator of the fraction.
Denominator: The property to get and set the denominator of the fraction.

Constructors

Fraction(): The default constructor that initializes the fraction to 1/1.
Fraction(int numerator, int denominator): The constructor that initializes the fraction to the given numerator and denominator.

Methods

Add(right: Fraction) Fraction: Adds the given fraction to the current fraction. Returns a new fraction.
Subtract(right: Fraction) Fraction: Subtracts the given fraction from the current fraction. Returns a new fraction.
Multiply(right: Fraction) Fraction: Multiplies the given fraction with the current fraction. Returns a new fraction.
Divide(right: Fraction) Fraction: Divides the current fraction by the given fraction. Returns a new fraction.
Reciprocal() Fraction: Returns the reciprocal of the current fraction as a new fraction.
Invert() Fraction: Inverts the current fraction.
Simplify() Fraction: Simplifies the current fraction.
Result() double: Returns the result of the fraction as a double.
ToString() string: Returns the string representation of the fraction in the format numerator/denominator. (e.g. 1/2)

Console Application

The FractionsConsoleApp is a simple console application that demonstrates the usage of the Fractions library. The application is a CLI calculator that allows the user to perform basic arithmetic operations on fractions.

When starting the application you will be greeted with the following menu:

It first displays a welcome message. Then it shows the two constructors of the Fraction class. The first constructor initializes the fraction to 1/1, and the second constructor initializes the fraction to the given numerator and denominator. After that, it displays the different methods of the Fraction class that you can use to perform arithmetic operations on fractions. All with examples on how to use them. Then a note about the Fraction class and the current fraction, and finally a list of commands you can use in the console.

After the menu, it displays a prompt 1/1 >. This is the currect fraction you will perform operations on. You can then enter a command followed by a fraction to perform an operation. For example, to add 1/2 to the current fraction, you can enter add 1/2.

1/1 > add 1/2
3/2 >

As a result we got 3/2 which is the result of 1/1 + 1/2. Other operations can be performed in the same way.

You can also display info about the current fraction by entering numerator or denominator:

3/2 > numerator
3
3/2 > denominator
2
3/2 >

To switch the numerator and denominator of the current fraction, you can enter reciprocal:

3/2 > reciprocal
2/3 >

Or you can invert the current fraction by entering invert:

2/3 > invert
-2/3 >

If you want to start over with a new fraction, you can enter new <fraction>. For example, to set the current fraction to 2/8, you can enter new 2/8:

-2/3 > new 2/8
2/8 >

Now we can perform simpify to simplify the fraction:

2/8 > simplify
1/4 >

To display the result of the current fraction, you can enter result:

1/4 > result
0.25
1/4 >

Now you have a basic understanding of how to use the console application. You can explore more commands by entering help in the console.

WPF Application

The FractionsWpfApp is a simple WPF application that demonstrates the usage of the Fractions library. The application is a GUI calculator that allows the user to perform basic arithmetic operations on fractions.

When starting the application you will be greeted with the following window:

The window has a basic fraction operation already set up. 3/4 + 1/2 = 5/4. You can change the operation by entering new fractions in the text boxes and selecting an operation from the dropdown.

The result is always calculated automatically.

You can change the operation by clicking on it and then selecting a new operation from the operation options. Lets change the operation from + to -.

Now we have clicked the + operation it has been highlighted and we can now select the - operation. The result will be calculated automatically.

Now lets invert the first fraction. We can do this by clicking on the -x button and then clicking on the first fraction. After clicking on the -x button we see it gets highlighted and when we hover over the first fraction it also gets highlighted. When we click on the first fraction it will be inverted and the result will be calculated automatically.

We can also add a new fraction to the operation. We can do this by clicking on the N button. After clicking on the N button, 1/1 will be added. You can add up to 8 fractions.

If you want to remove a fraction you can click on the X button. After clicking on the X button the fraction will be removed. There always has to be at least one fraction in the operation.

You can test the other operations yourself by cloning this repo.

Have fun with the Fractions Calculator!

xUnit Tests

The FractionsTests project contains unit tests for the Fractions library. The main test class is UnitTestFraction in the TestFractionLibrary namespace.

Here are the tests included in the UnitTestFraction class:

TestConstructor: Tests the constructor of the Fraction class.
TestProperties: Tests the properties of the Fraction class.
TestAdd: Tests the addition operation of the Fraction class.
TestSubtract: Tests the subtraction operation of the Fraction class.
TestMultiply: Tests the multiplication operation of the Fraction class.
TestDevide: Tests the division operation of the Fraction class.
TestReciprocal: Tests the reciprocal operation of the Fraction class.
TestInvert: Tests the inversion operation of the Fraction class.
TestSimplify: Tests the simplification operation of the Fraction class.
TestResult: Tests the result operation of the Fraction class.
TestToString: Tests the ToString method of the Fraction class.

Each test is marked with the [Fact] attribute, indicating that it is a test method that should be run by the test runner.

To run these tests, you can use the dotnet test command in the terminal, or use the test runner in Visual Studio.

Future Improvements

Here are some ideas for future improvements.

FractionLibrary

Handle operations between a fraction and another fraction.
Handle operations between a fraction and integer.
Let the operation methods take in any number of fractions.

FractionsConsoleApp

Add a way to save and load fractions.
Add tab completion for commands.

WPFFractionCalculator

Clear button to clear all fractions.
Give about window a better layout.
Add a history of operations.

SimonStnn/fractions