C# Homework in 20 hours

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Question # 1 • Write a class ‘Shape’ that contains the following

– Constructor takes one argument, string name • Constructor prints “Shape called <name> created”

– Abstract method ‘calculateArea’

– Method ‘ToString’ which prints “<count> This is a shape object called <name>”

– Protected field ‘name’ and relevant properties for the same

– Static field ‘count’ which gets incremented every time a new instance of shape is created or when an instance of its derived class is created.

– Add a protected filed for ‘color’ and set it to Black

• Write a class ‘circle’ which inherits from above mentioned class ‘shape’ and have additional members as below

– Constructor that takes one parameter ‘name’ and prints relevant message, sets ‘radius’ to default value

– Constructor that takes two parameters ‘name’ and ‘radius’ and also prints relevant message

– Protected field ‘radius’ and relevant properties

– Create a protected field for ‘color’ by hiding base class color (using ‘new’ keyword) and set its value to Blue, create relevant properties for this field

– Implementation for method ‘calculateArea’

– Override ‘ToString’ method to print message: ‘This is a Circle object called <name> whose radius is <radius> and area is <area> and of color <color>”

• Write a class ‘rectangle’ which inherits from above mentioned class ‘shape’ and have additional members as below

– Constructor that takes one parameter ‘name’ and prints relevant message, sets ‘width’ and ‘length’ to default value

– Constructor that takes three parameters ‘name’, ‘length’ and ‘width’ and also prints relevant message

– Protected fields ‘length’, ‘width’ and relevant properties

– Create a protected field for ‘color’ by hiding base class color (using ‘new’ keyword) and set its value to Red , create relevant properties for this field

– Implementation for method ‘calculateArea’

– Override ‘ToString’ method to print: "This is a Rectangle object called <name> whose length is <length> and width is <width> and area is <area> of color <color>”

Question # 1 Contd. • Write a class ‘square’ which inherits from above mentioned class ‘rectangle’ and have additional members

as below – Constructor that takes one parameter ‘name’ and prints relevant message, sets ‘width’ to default value, ‘length’ to

same value as ‘width’

– Constructor that takes two parameters ‘name’ and ‘width’, ‘length’ to same value as ‘width’ and also prints relevant message

– Protected fields ‘length’, ‘width’ and relevant properties if needed

– Create a protected field for ‘color’ by hiding base class color (using ‘new’ keyword) and set its value to White , create relevant properties for this field

– Implementation for method ‘calculateArea’ if needed

– Override ‘ToString’ method to print: "This is a Square object called <name> whose length is <length> and width is <width> and area is <area> of color <color>”

• Use the following for the Main() method for your program – Circle circleA = new Circle();

– Circle circleB = new Circle("Circle-B");

– Circle circleC = new Circle("Circle-C", 5);

– Rectangle rectangleA = new Rectangle();

– Rectangle rectangleB = new Rectangle("Rectangle-B");

– Rectangle rectangleC = new Rectangle("Rectangle-C", 5, 8);

– Square squareA = new Square();

– Square squareB = new Square("Square-B");

– Square squareC = new Square("Square-C", 5);

– Console.WriteLine();

– Console.WriteLine(circleA);

– Console.WriteLine(circleB);

– Console.WriteLine(circleC);

– Console.WriteLine(rectangleA);

– Console.WriteLine(rectangleB);

– Console.WriteLine(rectangleC);

– Console.WriteLine(squareA);

– Console.WriteLine(squareB);

– Console.WriteLine(squareC);

– Console.WriteLine();

– Console.WriteLine(circleA.Name + "\t" + circleA.Radius + " has area: " + circleA.calculateArea() + "\t" + circleA.Color);

– Console.WriteLine(circleB.Name + "\t" + circleB.Radius + " has area: " + circleB.calculateArea() + "\t" + circleB.Color);

– Console.WriteLine(circleC.Name + "\t" + circleC.Radius + " has area: " + circleC.calculateArea() + "\t" + circleC.Color);

– Console.WriteLine(rectangleA.Name + "\t" + rectangleA.Width + "\t" + rectangleA.Length + " has area: " + rectangleA.calculateArea() + "\t" + rectangleB.Color);

– Console.WriteLine(rectangleB.Name + "\t" + rectangleB.Width + "\t" + rectangleB.Length + " has area: " + rectangleB.calculateArea() + "\t" + rectangleB.Color);

– Console.WriteLine(rectangleC.Name + "\t" + rectangleC.Width + "\t" + rectangleC.Length + " has area: " + rectangleC.calculateArea() + "\t" + rectangleC.Color);

– Console.WriteLine(squareA.Name + "\t" + squareA.Width + " has area: " + squareA.calculateArea() + "\t" + squareA.Color);

– Console.WriteLine(squareB.Name + "\t" + squareB.Width + " has area: " + squareB.calculateArea() + "\t" + squareB.Color);

– Console.WriteLine(squareC.Name + "\t" + squareC.Width + " has area: " + squareC.calculateArea() + "\t" + squareC.Color);

– Console.Read();

Question # 2 • Modify the Library example for the following changes

• Create a new Interface – interface IDigital

{ uint LengthInSeconds { get; set; } DigitalDisc.DiscType MediaType { get; set; }

// following method will return Hours, Minutes, Sec // for the duration of digital media (lengthSeconds) // e.g., 1:30:25 string getHMS();

}

• Implement IDigital interface with Music, Movie and AudioBook class – Make other necessary changes in application to retain the functionality

– Add lines in Main() method to check-out and check-in a Music item, Movie item and AudioBook item – one each

– From Main() method, print duration for each of Music item, Movie item and AudioBook item in HH:MM:SS format (no zero padding required)

Question # 3 • Modify the Library example for the following changes • Create a new List<Item> as a private member of Item class

– Implement necessary methods to get/set an element publicly for this List

• Implement IComparable interface which compares based on ‘year’ field of Item class – Hint: See ‘Simple Generics’ example which compares Persons based on their

age

• Implement ItemCollection class which implements IEnumerable interface – Use Dictionary<uint, Item> to list all Items accessible by ‘year’

• Dictionary requires unique key. So have only one item per year for this example

– Implement Indexer to access items by value of ‘year’ • Hint: See ‘String Indexer’ example

• At the end of Main() method – Print all (unsorted) elements of List<Item> using Iterator

– Sort elements of List<Item> based on ‘year’

– Print all (sorted) elements of List<Item> using Iterator

– Print all elements in dictionary collection using Indexer

Question # 4 • Modify the Library example for the following changes

• Add a method to read Items from a text file using Regex to parse the entries where each entry is in the following format per line – Type: Book Year: 1991 Title: This is book 1

ISBN:1234567890 Pages: 500 Authors: Smith, John; Brown, Jack

– …And likewise for other media types also

– Using above data, populate List and Dictionary

• Add a method to write the LibraryCatalog.txt file which dumps all entries in plain text format (as per above mentioned format)

• (Optional) Add a method to write LINQ expression to do a query all Items based on ‘year’ and return the match – Modify Main() method to execute search and print the

result

Question # 5 (Optional) • Modify the Library example for the following changes

• Add a method to write the items in the library (iterate through List) into an XML file using XmlWriter class

• Sample Output: – <Library>

<Author> <FirstName>John</FirstName> <LastName>Smith</LastName>

</Author> …

</Authors> </Item> <Item Type=“AudioBook”> … </Item>

</Library>