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fine-codefine-code
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‎GaddisChallenges.java‎

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import java.util.Scanner;
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public class GaddisChallenges {
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private Scanner scan = new Scanner(System.in);
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public static void main(String[] args) {
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print("Starting Chapter 3 Challenges from the Gaddis book!");
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print("Question 1: Roman Numeral Converter");
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romanNumeralConverter();
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}
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private void print(String text) {
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System.out.println(text);
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}
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private void romanNumeralConverter() {
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print("Enter a number within the range of 1 through 10");
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int userNumber = scan.nextInt();
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}
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}

‎MagicDates.java‎

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public class MagicDates extends GaddisChallenges {
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private int userMonth;
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private int userDay;
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private int userYear;
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private int[] numDaysInMonth = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
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public void start() {
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print("Ready for some magic? Let's see if you can guess a Magic Date! ");
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print("Enter a numerical value for a month: (Example: 1 for January");
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int tempMonth = scan.nextInt();
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if(tempMonth > 0 && <= 12) {
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userMonth = tempMonth;
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}
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else {
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print("You entered a value that is out of range");
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}
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print("Enter a day in the month: (Example: 15 for the 15th of the month");
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tempDay = scan.nextInt();
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if (tempDay > 0 && <= numDaysInMonth[userMonth - 1]) {
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userDay = tempDay;
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}
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else {
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print("That day is invalid");
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}
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print("Enter a two-digit year: (Example: 08 for 2008");
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tempYear = scan.nextInt();
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if (tempYear.toString().length() == 2) {
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userYear = tempYear;
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}
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if (calculateMagic()) {
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print("Hooray! You chose a Magic Date! " +
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userMonth " * " + userDay + " = " + userYear)
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}
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}
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private calculateMagic() {
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return (userMonth * userDay == userYear);
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}
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}

‎RomanNumeralConverter.java‎

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public class RomanNumeralConverter extends GaddisChallenges {
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private int userNumber;
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private String[] romanNumerals = ["I", "II", "III", "IV", "V",
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"VI", "VII", "VIII", "IX", "X"];
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private void start() {
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print("Enter a number within the range of 1 through 10");
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userNumber = scan.nextInt();
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if (userNumber >= 1 && userNumber <= 10) {
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print("The Roman Numeral for " + userNumber
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+ " is " + convert(userNumber));
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}
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else {
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print("Error: you chose a number that is out of range")
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}
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}
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private String convert(int number) {
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return romanNumerals[number-1];
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}
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}

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