Assignment 03

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Centennial College *

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Feb 20, 2024

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Programming II Medal: enums, properties, filtering a list Page 1 of 21 Part A This exercise you will be exploring more usage of the static keyword. You must following the specifications exactly The Account class This is the front end of the application. There are 12 members. Account Class Constants - TRANSIT_NUMBER : int = 314 Fields $- NEXT_ACCOUNT_NUMBER : int + «readonly» Number : string Properties + «property private setter» Balance : double + «property private setter» Names : List < string > Methods - «constructor» Account(number : string , name : string , balance : double ) $ «constructor» Account() $+ CreateAccount(name : string , balance : double ) : Account + ToString () : string + Deposit(amount : double ) : void + Withdraw(amount : double ) : void + AddName(name : string ) : void

Programming II Medal: enums, properties, filtering a list Page 2 of 21 Description of class members Constants: TRANSIT_NUMBER – this private int is a constant representing the branch number of all the accounts. That is initialized to 314. It is used in the CreateAccount() method to build the account number of this account. Fields: NEXT_ACCOUNT_NUMBER – this private class variable is an int representing the unique number to be used when creating a new account. This is initialized in the static constructor. This is incremented in the instance constructor Number – this public instance variable is a string indicating the current account number of this object reference. This must be decorated with the readonly keyword. This is set in the Account(string, string, double) method. Properties: Balance – this property is a double that represents the current balance of this object. . This getter is public and the setter is private. Names – this property is a list of string representing the name associated with this object. This getter is public and the setter is private. Constructor: There are two constructors for this class: a static that is called before any member is accessed and a private one to prevent object instantiation outside of class. static Account() – This is the static constructor. It will be used to initialize the class variable CURRENT_ACCOUNT_NUMBER to a suitable value e.g. 100_000 private Account( string number, string name, double balance) – This is a private constructor that does the following:  The Number field and the Balance property are initialized to the values of the arguments  The Names property is initialised to an empty list (use the new operator). And the argument is added to this collection A const is a value that cannot be modified. Its value is set at declaration. i.e. When the program is compiled. A readonly field is like a consts but it is normally assigned when the program is running. A static constructor is used to initialise the static fields and properties. It is invoked once in the life time of a program, before ANY member is accessed. There is no access modifier i.e. public, protected or private

Programming II Medal: enums, properties, filtering a list Page 3 of 21 Methods public static Account CreateAccount( string name, double balance = 500) – This is a public static method is used to create accounts. It does the following:  Builds an account number from the TRANSIT_NUMBER and CURRENT_ACCOUNT_NUMBER according to the template “AC-[transit number]-[current account number]. e.g. if the value of TRANSIT_NUMBER and CURRENT_ACCOUNT_NUMBER are 314 and 10005 respectively then the account number will be "AC-314-10005". [Hint: use string.Format() method to do this.]  It also increments the CURRENT_ACCOUNT_NUMBER field so the next object will have a unique number.  Instantiate a new account object with the appropriate arguments.  Returns the above object public void AddName( string name) – This is a public method adds the argument to the Names collection. It is possible to have multiple names associated with this account. This method does not return a value. public void Deposit( double amount) – This is a public method that increases the property Balance by the amount specified by the argument. This method does not return a value. public void Withdraw( double amount) – This is a public method that decreases the property Balance by the amount specified by the argument. This method does not return a value. public override string ToString() – Add word “Liaison” to the output of the method please This is a public method overrides the corresponding method in the object class to return a stringify form of the object. To display the Names field, you will have to do some extra work because it is a list of strings [] Test Harness Insert the following code statements in your Program.cs file: List < Account > accounts = new List < Account >(); Random rand = new Random (); accounts.Add( Account .CreateAccount( "Narendra" , rand.Next(50, 500))); accounts.Add( Account .CreateAccount( "Ilia" , rand.Next(50, 500))); accounts.Add( Account .CreateAccount( "Yin" , rand.Next(50, 500))); accounts.Add( Account .CreateAccount( "Arben" , rand.Next(50, 500))); accounts.Add( Account .CreateAccount( "Patrick" , rand.Next(50, 500))); accounts.Add( Account .CreateAccount( "Joanne" , rand.Next(50, 500))); The static string method Join enables you to stringify a collection. Use the following code to get string from a collection: string .Join( ", " , Names);

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Programming II Medal: enums, properties, filtering a list Page 4 of 21 accounts.Add( Account .CreateAccount( "Nicoleta" , rand.Next(50, 500))); accounts.Add( Account .CreateAccount( "Mohammed" , rand.Next(50, 500))); accounts.Add( Account .CreateAccount( "Hao" , rand.Next(50, 500))); accounts.Add( Account .CreateAccount( "Mayy" , rand.Next(50, 500))); Console .WriteLine( "\nAll accounts" ); foreach ( Account account in accounts) { Console .WriteLine(account); } foreach ( Account account in accounts) { account.Deposit(rand.Next(4, 8) * 10); } Console .WriteLine( "\nAfter deposit " ); foreach ( Account account in accounts) { Console .WriteLine(account); } foreach ( Account account in accounts) { account.Withdraw(rand.Next(2, 5) * 10); if (account.Balance > 300) account.AddName( "(Hacked)" ); } Console .WriteLine( "\nAfter withdrawal" ); foreach ( Account account in accounts) { Console .WriteLine(account); } Test Harness Output Note the following balances will be different from the following output. All accounts [AC-314-10000] Narendra $390.00 [AC-314-10001] Ilia $228.00 [AC-314-10002] Yin $210.00 [AC-314-10003] Arben $351.00 [AC-314-10004] Patrick $224.00 [AC-314-10005] Joanne $210.00 [AC-314-10006] Nicoleta $126.00

Programming II Medal: enums, properties, filtering a list Page 5 of 21 [AC-314-10007] Mohammed $194.00 After deposit [AC-314-10000] Narendra $445.55 [AC-314-10001] Ilia $283.55 [AC-314-10002] Yin $265.55 [AC-314-10003] Arben $406.55 [AC-314-10004] Patrick $279.55 [AC-314-10005] Joanne $265.55 [AC-314-10006] Nicoleta $181.55 [AC-314-10007] Mohammed $249.55 After withdrawal [AC-314-10000] Narendra, (Hacked) $444.44 [AC-314-10001] Ilia $282.44 [AC-314-10002] Yin $264.44 [AC-314-10003] Arben, (Hacked) $405.44 [AC-314-10004] Patrick $278.44 [AC-314-10005] Joanne $264.44 [AC-314-10006] Nicoleta $180.44 [AC-314-10007] Mohammed $248.44 Press any key to continue . . .

Programming II Medal: enums, properties, filtering a list Page 6 of 21 Part B You will practice using Properties and iterating a list. The MedalColor Enum Code the MedalColor enum below: This enum consist of 3 constants which does not require any special treatment (such as setting any Flags attribute). MedalColor enum Constants Bronze Silver Gold The Medal Class Code the Medal class below: This class comprise of five properties, a constructor and a ToString() method. All the properties are public readonly. Medal Class Properties + «property setter absent» Name : string + «property setter absent» TheEvent : string + «property setter absent» Color : MedalColor + «property setter absent» Year : int + «property setter absent» IsRecord : bool Methods + «constructor» Medal( name : string ,

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Programming II Medal: enums, properties, filtering a list Page 7 of 21 theEvent : string , color : string , year : int , isRecord : bool ) + ToString() : string Description of class members Properties: All the properties have public getter and the setter is absent making them all readonly properties Name – this is a string representing the holder of this object. The getter is public and the setter is absent. TheEvent – this is a string representing the event of this object. (Event is a reserved word in C#). The getter is public and the setter is absent. Color – this is an enum representing the color of this object The getter is public and the setter is absent. Year – this is an integer representing the year of this object. The getter is public and the setter is absent. IsRecord – this is a bool indicating if this was a record setting event. The getter is public and the setter is absent. Fields: No fields are defined in this class Constructor: public Medal( string name, string theEvent, MedalColor color, int year, bool isRecord) – This public constructor takes five arguments: a string representing the name, a string representing the event, a string representing the type of medal, an integer representing the year and a bool indicating if a World Record or Olympic Record was set in this event. It assigns the arguments to the appropriate fields. Methods: public override string ToString() – This public method overrides the ToString of the object class. It does not take any argument and returns a string representation of the object. You may return a string in the format “ 2012 - Boxing(R) Narendra(Gold) ”.

Programming II Medal: enums, properties, filtering a list Page 8 of 21 If the event is not a record event then the “ (R) ” should not be present in the output. The ToString() method is the best place to implement this feature.

Programming II Account: private constructor, const, readonly, static Test Harness Insert the following code statements in the Main() method of your Program.cs file: //create a medal object Medal m1 = new Medal ( "Horace Gwynne " , "Boxing" , MedalColor. Gold , 2012, true ); //print the object Console .WriteLine(m1); //print only the name of the medal holder Console .WriteLine(m1.Name); //create another object Medal m2 = new Medal ( "Michael Phelps" , "Swimming" , MedalColor. Gold , 2012, false ); //print the updated m2 Console .WriteLine(m2); //create a list to store the medal objects List < Medal > medals = new List < Medal >(){ m1, m2}; medals.Add( new Medal ( "Ryan Cochrane " , "Swimming" , MedalColor. Silver , 2012, false )); medals.Add( new Medal ( "Adam van Koeverden " , "Canoeing" , MedalColor. Silver , 2012, false )); medals.Add( new Medal ( "Rosie MacLennan " , "Gymnastics" , MedalColor. Gold , 2012, false )); medals.Add( new Medal ( "Christine Girard " , "Weightlifting" , MedalColor. Bronze , 2012, false )); medals.Add( new Medal ( "Charles Hamelin " , "Short Track" , MedalColor. Gold , 2014, true )); medals.Add( new Medal ( "Alexandre Bilodeau " , "Freestyle skiing" , MedalColor. Gold , 2012, true )); medals.Add( new Medal ( "Jennifer Jones " , "Curling" , MedalColor. Gold , 2014, false )); medals.Add( new Medal ( "Charle Cournoyer " , "Short Track" , MedalColor. Bronze , 2014, false )); medals.Add( new Medal ( "Mark McMorris " , "Snowboarding" , MedalColor. Bronze , 2014, false )); medals.Add( new Medal ( "Sidney Crosby " , "Ice Hockey" , MedalColor. Gold , 2014, false) ); medals.Add( new Medal ( "Brad Jacobs " , "Curling" , MedalColor. Gold , 2014, false) ); medals.Add( new Medal ( "Ryan Fry " , "Curling" , MedalColor. Gold , 2014, false) ); Page 9 of 21

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Programming II Account: private constructor, const, readonly, static medals.Add( new Medal ( "Antoine Valois-Fortier " , "Judo" , MedalColor. Bronze , 2012, false )); medals.Add( new Medal ( "Brent Hayden " , "Swimming" , MedalColor. Bronze , 2012, false) ); //prints a numbered list of 16 medals. Console .WriteLine( "\n\nAll 16 medals" ); //prints a numbered list of 16 names (ONLY) Console .WriteLine( "\n\nAll 16 names" ); //prints a numbered list of 9 gold medals Console .WriteLine( "\n\nAll 9 gold medals" ); //prints a numbered list of 9 medals in 2012 Console .WriteLine( "\n\nAll 9 medals" ); //prints a numbered list of 4 gold medals in 2012 Console .WriteLine( "\n\nAll 4 gold medals" ); //prints a numbered list of 3 world record medals Console .WriteLine( "\n\nAll 3 records" ); //saving all the medal to file Medals.txt Console .WriteLine( "\n\nSaving to file" ); Page 10 of 21

Programming II Account: private constructor, const, readonly, static Part C You will be practicing to read from a file and building a relatively more complex system consisting o the three interconnected types that is illustrated below: All the above type must decorated with the public keyword The SongGenre enum This enum comprise of seven types of songs To code this add a new item to your project and select the class option. Make the necessary changes to the header to reflect the enum type. You should decorate this enum with the Flags attribute, because values may be combined e.g. a song may belong to multiple genres such as Country+Blues. In order to make the flags work as you would expect, you must set each value to an ascending power of 2 e.g. 0, 1, 2, 4, 8, 16 … or simply use the binary values as shown in the diagram below. SongGenre Enum Members Unclassified = 0 Pop = 0b1 Rock = 0b10 Blues = 0b100 Country = 0b1_000 Metal = 0b10_000 Soul = 0b100_000 If you examine the binary values for each enum, you will notice that each value has exactly a single value one, therefore as possible value can only come from a unique combination of the base value. e.g. 0b1_010 is a result of combining Rock and Country Page 11 of 21

Programming II Account: private constructor, const, readonly, static The Song class This acts like a record for the song. The setter is missing for all the properties Song Class Fields Properties + «property setter absent» Artist : string + «property setter absent» Title : string + «property setter absent» Length : double + «property setter absent» Genre : SongGenre Methods + «constructor» Song(title : string , artist : string , length : double , genre : SongGenre ) + ToString() : string Description of the class members Fields There are no fields. Properties: This class comprise of four auto-implemented properties with public getters and setters absent. See the UML class diagram above for more details. Constructor: public Song( string title, string artist, double length, SongGenre genre) – This constructor that takes four arguments and assigns them to the appropriate properties. Method: public override string ToString() – This public method overrides the ToString() method of the object class. It does not take any argument and returns a string representation of the object. See the output for hints on the return value of this method. Page 12 of 21

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Here a foreach loop is recommended for all of the overloaded DisplaySongs methods. Programming II Account: private constructor, const, readonly, static The Library class This is the front end of the application. This is a static class therefore all the members also have to be static. Remember class members are accessed using the type instead of object reference. Library Static Class Fields $- songs : List < Song > Methods $+ LoadSongs(filename : string ,) : void $+ DisplaySongs() : void $+ DisplaySongs(longerThan : double ) : void $+ DisplaySongs(genre : SongGenre ) : void $+ DisplaySongs(artist : string ) : void Description of class members Fields: songs – this private field is a list of song object is a class variable. Properties: There are no properties. Constructor: There is no constructor for this class. Methods There are four over-loaded methods. Remember that overloading is a technique used to reduce the complexity of the API exposed by the Song class. public static void DisplaySongs() – This is a public class method that does not take any argument and displays all the songs in the collection. public static void DisplaySongs( double longerThan) – This is a public class method that takes a double argument and displays only songs that are longer than the argument. Page 13 of 21

The contents of text file Baby Justin Bebier 3.35 Pop This is a complex method and rightfully it should be a part of the Song Class Programming II Account: private constructor, const, readonly, static public static void DisplaySongs( SongGenre genre) – This is a public class method that takes a SongGenre argument and displays only songs that are of this genre. You must not test for equality, you should use the HasFlags() method. public static void DisplaySongs( string artist) – This is a public class method that takes a string argument and displays only songs by this artist. public static void LoadSongs( string fileName) – This a class method that is public. It takes a single string argument that represents a text file containing a collection of songs. You will read all the data and create songs and add it to the songs collection. Examine the contents of the files for a better understanding of how this should be done. You will have to read four lines to create one Song. Your loop body should have four ReadLine(). The recipe below might clarify things:  Initialize the songs field to a new List of Song  Declare four string variable (title, artist, length, genre) to store the results of four reader.ReadLine() .  The first ReadLine() is a string representing the artist of the song. This can and should used as a check for termination condition. If this is empty then there are no more songs to read i.e. it is the end of the file  The next ReadLine() will get the title  The next ReadLine() will be a string that represents the genre. Use the Enum.Parse() to get the required type  The next ReadLine() will be a string that represents the length. Use the Convert.ToDouble to get the required type  Use the above four variables to create a Song object.  Add the newly created object to the collection.  And finally do one more read for the title to re-enter the loop. P.S. Before running the Library .LoadSongs() you will need to copy the file wk03_lab09_song4.txt (or any text file that has some songs in the above format) to the bin\debug folder or where the executable is created. Page 14 of 21

Programming II Account: private constructor, const, readonly, static Test Harness Insert the following code statements in the Main() method of your Program.cs file: //To test the constructor and the ToString method Console .WriteLine( new Song ( "Baby" , "Justin Bebier" , 3.35, SongGenre .Pop)); //This is first time that you are using the bitwise or. It is used to specify a combination of genres Console .WriteLine( new Song ( "The Promise" , "Chris Cornell" , 4.26, SongGenre .Country | SongGenre .Rock)); Library .LoadSongs( "Week_03_lab_09_songs4.txt" ); //Class methods are invoke with the class name Console .WriteLine( "\n\nAll songs" ); Library .DisplaySongs(); SongGenre genre = SongGenre .Rock; Console .WriteLine($ "\n\n{ genre } songs" ); Library .DisplaySongs(genre); string artist = "Bob Dylan" ; Console .WriteLine($ "\n\nSongs by { artist }" ); Library .DisplaySongs(artist); double length = 5.0; Console .WriteLine($ "\n\nSongs more than { length }mins" ); Library .DisplaySongs(length); Page 15 of 21

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Programming II Account: private constructor, const, readonly, static Program output Baby by Justin Bebier (Pop) 3.35min The Promise by Chris Cornell (Rock, Country) 4.26min All songs Baby by Justin Bebier (Pop) 3.35min Fearless by Taylor Swift (Pop) 4.03min Runaway Love by Ludacris (Pop) 4.41min My Heart Will Go On by Celine Dion (Pop) 4.41min Jesus Take The Wheel by Carrie Underwood (Country) 3.31min If Tomorrow Never Comes by Garth Brooks (Country) 3.40min Set Fire To Rain by Adele (Soul) 4.01min Don't You Remember by Adele (Soul) 3.03min Signed Sealed Deliverd I'm Yours by Stevie Wonder (Soul) 2.39min Just Another Night by Mick Jagger (Rock) 5.15min Brown Sugar by Mick Jagger (Rock) 3.50min All I Want Is You by Bono (Metal) 6.30min Beautiful Day by Bono (Metal) 4.08min Like A Rolling Stone by Bob Dylan (Rock) 6.08min Just Like a Woman by Bob Dylan (Rock) 4.51min Hurricane by Bob Dylan (Rock) 8.33min Subterranean Homesick Blues by Bob Dylan (Rock) 2.24min Tangled Up In Blue by Bob Dylan (Rock) 5.40min Love Me by Elvis Presley (Rock) 2.42min In The Getto by Elvis Presley (Rock) 2.31min All Shook Up by Elvis Presley (Rock) 1.54min Rock songs Just Another Night by Mick Jagger (Rock) 5.15min Brown Sugar by Mick Jagger (Rock) 3.50min Like A Rolling Stone by Bob Dylan (Rock) 6.08min Just Like a Woman by Bob Dylan (Rock) 4.51min Hurricane by Bob Dylan (Rock) 8.33min Subterranean Homesick Blues by Bob Dylan (Rock) 2.24min Tangled Up In Blue by Bob Dylan (Rock) 5.40min Love Me by Elvis Presley (Rock) 2.42min In The Getto by Elvis Presley (Rock) 2.31min All Shook Up by Elvis Presley (Rock) 1.54min Songs by Bob Dylan Like A Rolling Stone by Bob Dylan (Rock) 6.08min Just Like a Woman by Bob Dylan (Rock) 4.51min Hurricane by Bob Dylan (Rock) 8.33min Subterranean Homesick Blues by Bob Dylan (Rock) 2.24min Tangled Up In Blue by Bob Dylan (Rock) 5.40min Songs more than 5mins Just Another Night by Mick Jagger (Rock) 5.15min All I Want Is You by Bono (Metal) 6.30min Like A Rolling Stone by Bob Dylan (Rock) 6.08min Hurricane by Bob Dylan (Rock) 8.33min Tangled Up In Blue by Bob Dylan (Rock) 5.40min Press any key to continue . . . Page 16 of 21

Programming II Account: private constructor, const, readonly, static Part D Concepts You will learn about properties, enums, static members, lists and default arguments. Enums An enum is a user-define type like a class. However, all the members are constants with implied values. It provides an efficient way of defining a set of named integral constants such as the days of the week or months of the year or even the set of pre-defined colors. It supports a more robust programming style e.g. If you have a method that expects a month as an argument of type to a string, you will have do lots of defensive programming, instead define an enum type that has the 12 months. During development, the compiler will do the necessary checks for the require type hence you will do less programming. Static members The static decorator when used on a member indicates that member belongs to the type rather than an object. You will access that member using the type rather than an object reference. Static methods or properties may only access other static members. The only instance member that can be accessed is the constructor. You can recognize an instance member by the absence of the static modifier. Instance methods are able to access other instance members as well as class members. The TimeFormat Enum Sometimes you don’t even care about the underlining values as in this case or, (Maritial status: Single, Married, Widowed etc.), (Sale status: Confirmed, Shipped, Paid etc.) TimeFormat Enum Values Mil Hour12 Hour24 You may define/code this type in the Time.cs file, but it should be external to the Time class. Page 17 of 21

UML Class Diagram $  static A class member that is decorated with the static keyword implies that only one copy of this member exists and it is shared by all objects of the class. i.e. If it is changed then all object will see the new value immediately. A class method can only access other class member (fields/properties/methods) Programming II Account: private constructor, const, readonly, static The Time Class Code the Time class below: This class comprise of six members: a field, two properties and a constructor a SetTimeFormat() and a ToString() method. All the fields are private and all the methods are public Time Class Fields - $ TIME_FORMAT = TimeFormat .Hour12 : TimeFormat Properties + «setter absent» Hour : int + «setter absent» Minute : int Methods + «constructor» Time(hour = 0 : int , minute = 0: int ) + ToString() : string + $ SetFormat(timeFormat : TimeFormat ) : void Description of class members Fields: There are no fields for this class. Properties: TIME_FORMAT – this class variable is of type TimeFormat and it represents the intended format of the ToString() method. This field has private accessibility and it initializes to TimeFormat .Hour12 at declaration. Hour – this is an integer representing the hour value this object. This property has public read access and the setter is missing. Minute – this is an integer representing the minute value this object. This property has public read access and the setter is missing. Page 18 of 21

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A switch statement is probably the simplest way to implement this functionality This method must be static because it needs to access a static field. Programming II Account: private constructor, const, readonly, static Constructor: public Time( int hours = 0, int minutes = 0) – This is a public constructor that takes two integer arguments with default values of 0 . If checks if the first argument is between 0 and 24 it assigns it to the Hour property otherwise a value of 0 is assign to the hour property. Similarly the second argument is check if it is between 0 and 60 then it is assigned to the Minute property otherwise a value of 0 is assigned to the Minute property. Methods: public override string ToString() – This public method overrides the ToString of the object class. It does not take any argument and returns a string representation of the object. The return value will depend on the field TIME_FORMAT value of the class. So it is a good plan if you use a switch statement to handle the three possibilities. Your switch statement should check the value of the TIME_FORMAT field. If you have a Time object with the hours value as 18 and the minutes value as 5 then the print out of the object will be “ 1805 ” if TIME_FORMAT is set to TimeFormat .MIL. Use the d2 format specifier to get the leading zero. “ 18:05 ” if TIME_FORMAT is set to TimeFormat .HOUR24 . Again, use the d2 format specifier to get the leading zero. “ 6:05 PM ” if TIME_FORMAT is set to TimeFormat .HOUR12. Again, use the d2 format specifier to get the leading zero. public static void SetTimeFormat( TimeFormat time_format) – This a class method that is public. It takes a single TimeFormat argument and assigns it to the static TIME_FORMAT field. Page 19 of 21

Programming II Account: private constructor, const, readonly, static Test Harness Insert the following code statements in your Program.cs file: //create a list to store the objects List < Time > times = new List < Time >() { new Time (9, 35), new Time (18, 5), new Time (20, 500), new Time (10), new Time () }; //display all the objects TimeFormat format = TimeFormat .Hour12; Console .WriteLine( $"\n\nTime format is {format} " ); foreach ( Time t in times) { Console .WriteLine(t); } //change the format of the output format = TimeFormat .Mil; Console .WriteLine( $"\n\nSetting time format to {format} " ); //SetTimeFormat(TimeFormat) is a class member, so you need the type to access it Time .SetTimeFormat(format); //again display all the objects foreach ( Time t in times) { Console .WriteLine(t); } //change the format of the output format = TimeFormat .Hour24; Console .WriteLine( $"\n\nSetting time format to {format} " ); //SetTimeFormat(TimeFormat) is a class member, so you need the type to access it Time .SetTimeFormat(format); foreach ( Time t in times) { Console .WriteLine(t); } Page 20 of 21

Programming II Account: private constructor, const, readonly, static Your output will look like below: Time format is Hour12 9:35 AM 6:05 PM 8:00 PM 10:00 AM 0:00 AM Setting time format to Mil 0935 1805 2000 1000 0000 Setting time format to Hour24 09:35 18:05 20:00 10:00 00:00 Page 21 of 21

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