Question

Case Program 10 – 1:

Part 1:

Previously, you created a Contestant class for the Greenville Idol competition. The class includes a contestant’s name, talent code, and talent description. The competition has become so popular that separate contests with differing entry fees have been established for children, teenagers, and adults.

Modify the Contestant class to contain a field Fee that holds the entry fee for each category, and add get and set accessors. Extend the Contestant class to create three subclasses: ChildContestant, TeenContestant, and AdultContestant.

Child contestants are 12 years old and younger, and their entry fee is $15. Teen contestants are between 13 and 17 years old, inclusive, and their entry fee is $20. Adult contestants are 18 years old and older, and their entry fee is $30. In each subclass, set the entry fee field to the correct value, and override the ToString() method to return a string that includes all the contestant data, including the age category and the entry fee.

For example, the output from ToString() should be displayed in the following format: Child Contestant Joeph S Fee $15.00 Teen Contestant Sara M Fee $20.00 Adult Contestant Joy D Fee $30.00

Part 2:

Modify the GreenvilleRevenue program so that it performs the following tasks:

The program prompts the user for the number of contestants in this year’s competition, which must be between 0 and 30. The program continues to prompt the user until a valid value is entered. The program prompts the user for the name, talent code, and age for each contestant. Along with the prompt for a talent code, display a list of valid categories. Based on the age entered for each contestant, create an object of the correct type (adult, teen, or child), and store it in an array of Contestant objects. Talent code categories should be displayed in the following format: Talent codes are: S Singing D Dancing M Musical instrument O Other After data entry is complete, display the total expected revenue, which is the sum of the entry fees for the contestants.

The total expected revenue should be displayed in the following format: Revenue expected this year is $65.00.

After data entry is complete, display the valid talent categories and then continuously prompt the user for talent codes, and display all the data for all the contestants in each category (using the ToString method for each contestant). Display an appropriate message if the entered code is not a character or a valid code.

Answer 1

using System;

namespace Wk4Chapter9
{
class Chapter9
{
static void Main()
{
int thisYearContestants;
int lastYearContestants;

Console.WriteLine("Please enter the number of contestants entered in last year's competition: ");
lastYearContestants = GetContestants();

Console.WriteLine("Please enter the number of contestants entered in this year's competition: ");
thisYearContestants = GetContestants();

DisplayContestantMessage(thisYearContestants, lastYearContestants); //revenue + contestant message

Contestant[] contestants = new Contestant[thisYearContestants];

FillArrays(thisYearContestants, contestants);
// PromptTalentCodes(thisYearContestants, contestants);
double totalrevenue = 0;
foreach (Contestant c in contestants)
{
totalrevenue += c.EntryFee;
//Display contestants
Console.WriteLine(c);
}
Console.WriteLine("Total Revenue: $" + totalrevenue);
}

static int GetContestants()
{
int contestants;
string input = Console.ReadLine();

while (!Int32.TryParse(input, out contestants) || (contestants < 0 || contestants > 30))
{

Console.WriteLine("Error. Please enter a value between 0 and 30.");
input = Console.ReadLine();
}
return contestants;
} //end GetContestants method

static void DisplayContestantMessage(int thisYearContestants, int lastYearContestants)
{
if ((lastYearContestants >= 0) && (lastYearContestants <= 30) && (thisYearContestants >= 0) && (thisYearContestants <= 30))
Console.WriteLine("The revenue expected for this year's competition : $" + thisYearContestants * 25 + '\n');
if (thisYearContestants > lastYearContestants * 2)
Console.WriteLine("The competition is more than twice as big this year!\n");
else
if (thisYearContestants > lastYearContestants && thisYearContestants <= (lastYearContestants * 2))
Console.WriteLine("The competition is bigger than ever!\n");
else
if (thisYearContestants < lastYearContestants)
Console.WriteLine("A tighter race this year! Come out and cast your vote!\n");
} // end DisplayContestantMessage

static void FillArrays(int thisYearContestants, Contestant[] contestants)
{
int x = 0;
string name;
int age;
char talent;
while (x < thisYearContestants)
{
Console.WriteLine("Enter Contestant Name: ");
name = Console.ReadLine();
Console.WriteLine("Enter Contestant age: ");
int.TryParse( Console.ReadLine(),out age);
Console.WriteLine("Talent codes are:");
for (int k = 0; k < Contestant.talentCodes.Length; ++k)
Console.WriteLine(" {0} {1}", Contestant.talentCodes[k], Contestant.talentStrings[k]);
Console.WriteLine("Please enter contestant " + (x + 1) + "'s talent code: ");

char.TryParse(Console.ReadLine(), out talent);
if (age <= 12)
{
contestants[x] = new ChildContestant();
contestants[x].Name = name;
contestants[x].TalentCode = talent;
++x;
}
else if (age >12 && age <=17)
{
contestants[x] = new TeenContestant();
contestants[x].Name = name;
contestants[x].TalentCode = talent;
++x;
}
else
{
contestants[x] = new AdultContestant();
contestants[x].Name = name;
contestants[x].TalentCode = talent;
++x;
}
}
}// end FillArrays method

static void PromptTalentCodes(int thisYearContestants, Contestant[] contestants)
{
int x;
char QUIT = 'Q';
char input;
bool isValid;
int pos = 0;
bool correct;

Console.WriteLine("\n ********************************************************** \n");

Console.WriteLine("To see the contestants by talent, please search a valid talent code or " + QUIT + " to quit: ");
Console.WriteLine("\nThe types of talent are:");
for (x = 0; x < Contestant.talentStrings.Length; ++x)
Console.WriteLine("{0, -6}{1, -20}", Contestant.talentCodes[x], Contestant.talentStrings[x]); //taken from ch9 sample problem

isValid = false;
while (!isValid)
{
if (!char.TryParse(Console.ReadLine(), out input)) // if user enters an invalid code
{
isValid = false;
Console.WriteLine("\nInvalid talent code. Please enter a valid talent code or " + QUIT + " to quit: ");
}
else
{
if (input == QUIT) // if user enters the Q to quit
isValid = true;
else
{
for (int k = 0; k < Contestant.talentCodes.Length; ++k)
{
if (input == Contestant.talentCodes[k]) // if user enters a valid talent code
{
isValid = true;
}
}
if (!isValid) //if user enters invalid talent code
{
Console.WriteLine(input + " is not a valid code.\n Please enter a talent code or " + QUIT + " to quit: ");
}
else
{
Console.WriteLine("\nContestants with talent " + input + "are: ");
correct = false;
for (x = 0; x < thisYearContestants; ++x)
{
if (contestants[x].TalentCode == input)
{
Console.WriteLine(contestants[x].Name);
correct = true;
}
}
if (!correct)
Console.WriteLine("No contestants entered with talent " + input + ".");
isValid = false;
Console.Write("\nEnter another talent code or " + QUIT + " to quit: ");
}
}
}
}
} // end PromptTalentCodes method

} //end first class

public class Contestant
{
public static char[] talentCodes = { 'S', 'D', 'M', 'O' };
public static string[] talentStrings = {"Singing", "Dancing",
"Musical instrument", "Other"};
public string Name { get; set; }
private char talentCode;
private string talent;
private double entryFee;
public double EntryFee
{
get
{
return entryFee;
}
set
{
entryFee = value;
}
}
public char TalentCode
{
get
{
return talentCode;
}
set
{
int pos = talentCodes.Length;
for (int x = 0; x < talentCodes.Length; ++x)
if (value == talentCodes[x])
pos = x;
if (pos == talentCodes.Length)
{
talentCode = 'I';
talent = "Invalid";
}
else
{
talentCode = value;
talent = talentStrings[pos];
}
}

}
public string Talent
{
get
{
return talent;
}
}
}
public class ChildContestant : Contestant
{
public ChildContestant()
{
EntryFee = 15;
}
public override string ToString()
{
return "Name: " + Name + "\n Talent Code: " + TalentCode +
"\n Talent Description: " + Talent + "\nEntry Fee: " + EntryFee +
"\nAge Category: Child";
}
}
public class TeenContestant:Contestant
{
public TeenContestant()
{
EntryFee = 20;
}
public override string ToString()
{
return "Name: " + Name + "\n Talent Code: " + TalentCode +
"\n Talent Description: " + Talent + "\nEntry Fee: " + EntryFee +
"\nAge Category: Teen";
}
}
public class AdultContestant:Contestant
{
public AdultContestant()
{
EntryFee = 30;
}
public override string ToString()
{
return "Name: " + Name + "\n Talent Code: " + TalentCode +
"\n Talent Description: " + Talent + "\nEntry Fee: " + EntryFee +
"\nAge Category: Adult";
}
}
  

} // end namespace

//output

S Singing D Dancing M Musical instrument o Other Please enter contestant 2's talent code: Enter Contestant Name Britney Enter Contestant age: 30 Talent codes are: S Singing D Dancing M Musical instrument o Other Please enter contestant 3's talent code: 0 Name: Mike Talent Code: 0 Talent Description: Other Entry Fee: 15 Age Category: Child Name: Pipe Talent Code: M Talent Description: Musical instrument Entry Fee: 30 Age Category: Adult Name: Britney Talent Code: 0 Talent Description: Other Entry Fee: 30 Age Category: Adult Total Revenue: $75 Press any key to continue .. .