Answered: ify your program so every data entry…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Related questions

Question

modify your program so every data entry statement uses a TryParse() method to ensure that each piece of data is the correct type.

using System;

using static System.Console;

using System.Globalization;

class GreenvilleRevenue

{

static void Main()

{

const int ENTRANCE_FEE = 25;

const int MIN_CONTESTANTS = 0;

const int MAX_CONTESTANTS = 30;

int numThisYear;

int numLastYear;

int revenue;

string[] names = new string[MAX_CONTESTANTS];

char[] talents = new char[MAX_CONTESTANTS];

char[] talentCodes = { 'S', 'D', 'M', 'O' };

string[] talentCodesStrings = { "Singing", "Dancing", "Musical instrument", "Other" };

int[] counts = { 0, 0, 0, 0 }; ;

numLastYear = GetContestantNumber("last", MIN_CONTESTANTS, MAX_CONTESTANTS);

numThisYear = GetContestantNumber("this", MIN_CONTESTANTS, MAX_CONTESTANTS);

revenue = numThisYear * ENTRANCE_FEE;

WriteLine("Last year's competition had {0} contestants, and this year's has {1} contestants",

numLastYear, numThisYear);

WriteLine("Revenue expected this year is {0}", revenue.ToString("C", CultureInfo.GetCultureInfo("en-US")));

DisplayRelationship(numThisYear, numLastYear);

GetContestantData(numThisYear, names, talents, talentCodes, talentCodesStrings, counts);

GetLists(numThisYear, talentCodes, talentCodesStrings, names, talents, counts);

}

public static int GetContestantNumber(string when, int min, int max)

{

string entryString;

int num;

{

Console.Write("Enter number of contestants {0} year >> ", when);

entryString = ReadLine();

bool success = Int32.TryParse(entryString, out num);

if (success)

{

if (num < min || num > max)

WriteLine("Number must be between {0} and {1}", min, max);

}

else

{

WriteLine("Invalid format - entry must be a single character");

WriteLine("That is not a valid code");

}

} while (num < min || num > max);

return num;

}

public static void DisplayRelationship(int numThisYear, int numLastYear)

{

if (numThisYear > 2 * numLastYear)

WriteLine("The competition is more than twice as big this year!");

else

if (numThisYear > numLastYear)

WriteLine("The competition is bigger than ever!");

else

if (numThisYear < numLastYear)

WriteLine("A tighter race this year! Come out and cast your vote!");

}

public static void GetContestantData(int numThisYear, string[] names, char[] talents, char[] talentCodes, string[] talentCodesStrings, int[] counts)

{

int x = 0;

bool isValid;

while (x < numThisYear)

{

Console.Write("Enter contestant name >> ");

names[x] = ReadLine();

WriteLine("Talent codes are:");

for (int y = 0; y < talentCodes.Length; ++y)

WriteLine(" {0} {1}", talentCodes[y], talentCodesStrings[y]);

while(true)

{

Console.Write(" Enter talent code >> ");

bool success=Char.TryParse(ReadLine(), out talents[x]);

if (!success)

WriteLine("Invalid format - entry must be a single character");

else

break;

}

isValid = false;

while (!isValid)

{

for (int z = 0; z < talentCodes.Length; ++z)

{

if (talents[x] == talentCodes[z])

{

isValid = true;

++counts[z];

}

if (!isValid)

{

WriteLine("That is not a valid code", talents[x]);

while (true)

{

Console.Write(" Enter talent code >> ");

bool success = Char.TryParse(ReadLine(), out talents[x]);

if (!success)

WriteLine("Invalid format - entry must be a single character");

else

break;

}

++x;

}

public static void GetLists(int numThisYear, char[] talentCodes, string[] talentCodesStrings, string[] names, char[] talents, int[] counts)

{

int x;

char QUIT = 'Z';

char option;

bool isValid;

int pos = 0;

bool found;

WriteLine("\nThe types of talent are:");

for (x = 0; x < counts.Length; ++x)

WriteLine("{0, -20} {1, 5}", talentCodesStrings[x], counts[x]);

while (true)

{

Console.Write("\nEnter a talent type or {0} to quit >> ", QUIT);

bool success = Char.TryParse(ReadLine(), out option);

if (!success)

WriteLine("Invalid format - entry must be a single character");

else

break;

}

while (option != QUIT)

{

isValid = false;

for (int z = 0; z < talentCodes.Length; ++z)

{

if (option == talentCodes[z])

{

isValid = true;

pos = z;

}

if (!isValid)

WriteLine("That is not a valid code", option);

else

{

WriteLine("\nContestants with talent {0} are:", talentCodesStrings[pos]);

found = false;

for (x = 0; x < numThisYear; ++x)

{

if (talents[x] == option)

{

WriteLine(names[x]);

found = true;

}

if (!found)

WriteLine("No contestants had talent {0}", talentCodesStrings[pos]);

}

while (true)

{

Console.Write("\nEnter a talent type or {0} to quit >> ", QUIT);

bool success = Char.TryParse(ReadLine(), out option);

if (!success)

WriteLine("Invalid format - entry must be a single character ");

else

break;

}

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