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Merge pull request #920 from aldrinm/50_horserace
Java implementation of Horserace
This commit is contained in:
Jeff Atwood
313
50_Horserace/java/Horserace.java
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313
50_Horserace/java/Horserace.java
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Random;
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import java.util.Scanner;
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/**
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* HORSERACE
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* <p>
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* Converted from BASIC to Java by Aldrin Misquitta (@aldrinm)
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*/
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public class Horserace {
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private static final String[] horseNames = {
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"JOE MAW",
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"L.B.J.",
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"MR.WASHBURN",
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"MISS KAREN",
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"JOLLY",
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"HORSE",
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"JELLY DO NOT",
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"MIDNIGHT"
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};
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public static final int MAX_DISTANCE = 28;
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public static final int NUM_HORSES = 8;
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public static void main(String[] args) {
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printHeader();
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Scanner scanner = new Scanner(System.in);
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Random random = new Random();
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printHelp(scanner);
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List<String> betNames = readBetNames(scanner);
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boolean donePlaying = false;
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while (!donePlaying) {
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int[] odds = generateOdds(random);
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int sumOdds = Arrays.stream(odds).sum();
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printOdds(sumOdds, odds);
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Map<String, Bet> bets = takeBets(scanner, betNames);
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var horsePositions = runRace(horseNames.length, sumOdds, odds, random);
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printRaceResults(horsePositions, bets, sumOdds, odds);
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donePlaying = readDonePlaying(scanner);
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}
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}
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private static int[] generateOdds(Random random) {
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int[] odds = new int[NUM_HORSES];
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for (int i = 0; i < NUM_HORSES; i++) {
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odds[i] = (int) (10 * random.nextFloat() + 1);
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}
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return odds;
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}
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private static void printOdds(int R, int[] D) {
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System.out.printf("%n%-28s%-14s%-14s%n%n", "HORSE", "NUMBER", "ODDS");
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for (int n = 0; n < horseNames.length; n++) {
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System.out.printf("%-28s% -14d%.6f :1%n", horseNames[n], n + 1, ((float) R / D[n]));
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}
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}
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private static boolean readDonePlaying(Scanner scan) {
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System.out.println("DO YOU WANT TO BET ON THE NEXT RACE ?");
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System.out.print("YES OR NO? ");
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String choice = scan.nextLine();
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return !choice.equalsIgnoreCase("YES");
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}
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/**
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* Simulate the race run, returning the final positions of the horses.
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*/
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private static int[] runRace(int numberOfHorses, int sumOdds, int[] odds, Random random) {
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int[] positionChange = new int[numberOfHorses];
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System.out.println();
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System.out.println("1 2 3 4 5 6 7 8");
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int totalDistance = 0;
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int[] currentPositions = new int[NUM_HORSES];
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int[] horsePositions = new int[NUM_HORSES];
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while (totalDistance < MAX_DISTANCE) {
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System.out.println("XXXXSTARTXXXX");
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for (int i = 0; i < numberOfHorses; i++) {
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horsePositions[i] = i + 1;
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positionChange[i] = calculatePositionChanges(sumOdds, odds[i], random);
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currentPositions[i] += positionChange[i];
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}
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sortHorsePositionsBasedOnCurrent(currentPositions, horsePositions);
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totalDistance = currentPositions[horsePositions[7] - 1];
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boolean raceFinished = false;
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int i = 0;
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while (i < NUM_HORSES && !raceFinished) {
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int distanceToNextHorse = currentPositions[(horsePositions[i] - 1)] - (i < 1 ? 0 : currentPositions[(horsePositions[i - 1] - 1)]);
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if (distanceToNextHorse != 0) {
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int a = 0;
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while (a < distanceToNextHorse && !raceFinished) {
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System.out.println();
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if (currentPositions[horsePositions[i] - 1] >= MAX_DISTANCE) {
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raceFinished = true;
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}
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a++;
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}
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}
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if (!raceFinished) {
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System.out.print(" " + horsePositions[i] + " "); // Print horse number
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}
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i++;
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}
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if (!raceFinished) {
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//Print additional empty lines
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for (int a = 0; a < MAX_DISTANCE - totalDistance; a++) {
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System.out.println();
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}
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}
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System.out.println("XXXXFINISHXXXX");
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System.out.println("\n");
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System.out.println("---------------------------------------------");
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System.out.println("\n");
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}
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return horsePositions;
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}
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/**
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* Sorts the horsePositions array in place, based on the currentPositions of the horses.
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* (bubble sort)
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*/
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private static void sortHorsePositionsBasedOnCurrent(int[] currentPositions, int[] horsePositions) {
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for (int l = 0; l < NUM_HORSES; l++) {
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int i = 0;
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/*
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uses a do-while instead of a for loop here, because in BASIC
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a FOR I=1 TO 0 causes at least one execution of the loop
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*/
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do {
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if (currentPositions[horsePositions[i] - 1] >= currentPositions[horsePositions[i + 1] - 1]) {
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int h = horsePositions[i];
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horsePositions[i] = horsePositions[i + 1];
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horsePositions[i + 1] = h;
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}
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i++;
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} while (i < (7 - l));
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}
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}
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private static int calculatePositionChanges(int r, int d, Random random) {
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int positionChange = (int) (100 * random.nextFloat() + 1);
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if (positionChange < 10) {
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positionChange = 1;
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} else {
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int s = (int) ((float) r / d + 0.5);
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if (positionChange < (s + 17)) {
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positionChange = 2;
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} else if (positionChange < s + 37) {
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positionChange = 3;
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} else if (positionChange < s + 57) {
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positionChange = 4;
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} else if (positionChange < s + 77) {
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positionChange = 5;
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} else if (positionChange < s + 92) {
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positionChange = 6;
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} else {
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positionChange = 7;
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}
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}
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return positionChange;
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}
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private static void printRaceResults(int[] m, Map<String, Bet> bets, int r, int[] d) {
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System.out.println("THE RACE RESULTS ARE:");
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int z9 = 1;
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for (int i = 7; i >= 0; i--) {
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int f = m[i];
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System.out.println();
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System.out.println(z9 + " PLACE HORSE NO. " + f + " AT " + (r / d[f - 1]) + ":1");
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z9++;
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}
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bets.forEach((betName, bet) -> {
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if (bet.horseNumber == m[7]) {
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int n = bet.horseNumber;
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System.out.println();
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System.out.printf("%s WINS $ %.2f %n", bet.betName, ((float) r / d[n]) * bet.amount);
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}
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});
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}
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private static Map<String, Bet> takeBets(Scanner scanner, List<String> betNames) {
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Map<String, Bet> bets = new HashMap<>();
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System.out.println("--------------------------------------------------");
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System.out.println("PLACE YOUR BETS...HORSE # THEN AMOUNT");
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for (String betName : betNames) {
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boolean validInput = false;
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while (!validInput) {
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int horseNumber = readInt(betName, scanner);//Q in the original
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double betAmount = readDouble("?", scanner); //P in the original
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if (betAmount < 1 || betAmount > 100000) {
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System.out.println(" YOU CAN'T DO THAT!");
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} else {
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bets.put(betName, new Bet(betName, horseNumber, betAmount));
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validInput = true;
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}
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}
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}
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return bets;
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}
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private static void printHelp(Scanner scanner) {
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System.out.print("DO YOU WANT DIRECTIONS");
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String directions = readChoice(scanner);
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if (!directions.equalsIgnoreCase("NO")) {
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System.out.println("UP TO 10 MAY PLAY. A TABLE OF ODDS WILL BE PRINTED. YOU");
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System.out.println("MAY BET ANY + AMOUNT UNDER 100000 ON ONE HORSE.");
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System.out.println("DURING THE RACE, A HORSE WILL BE SHOWN BY ITS");
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System.out.println("NUMBER. THE HORSES RACE DOWN THE PAPER!");
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System.out.println();
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}
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}
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private static String readChoice(Scanner scanner) {
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System.out.print("? ");
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return scanner.nextLine();
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}
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private static int readInt(String prompt, Scanner scanner) {
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System.out.print(prompt);
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while (true) {
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System.out.print("? ");
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String input = scanner.nextLine();
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try {
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return Integer.parseInt(input);
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} catch (NumberFormatException e) {
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System.out.println("!NUMBER EXPECTED - RETRY INPUT LINE");
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}
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}
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}
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private static double readDouble(String prompt, Scanner scanner) {
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System.out.print(prompt);
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while (true) {
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System.out.print("? ");
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String input = scanner.nextLine();
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try {
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return Double.parseDouble(input);
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} catch (NumberFormatException e) {
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System.out.println("!NUMBER EXPECTED - RETRY INPUT LINE");
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}
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}
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}
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private static List<String> readBetNames(Scanner scanner) {
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int c = readInt("HOW MANY WANT TO BET ", scanner);
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System.out.println("WHEN ? APPEARS,TYPE NAME");
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List<String> names = new ArrayList<>();
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for (int i = 1; i <= c; i++) {
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System.out.print("? ");
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names.add(scanner.nextLine());
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}
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return names;
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}
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private static void printHeader() {
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System.out.println(" HORSERACE");
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System.out.println(" CREATIVE COMPUTING MORRISTOWN, NEW JERSEY\n");
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System.out.println("\n\n");
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System.out.println("WELCOME TO SOUTH PORTLAND HIGH RACETRACK");
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System.out.println(" ...OWNED BY LAURIE CHEVALIER");
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}
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private static class Bet {
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String betName;
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int horseNumber;
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double amount;
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public Bet(String betName, int horseNumber, double amount) {
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this.betName = betName;
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this.horseNumber = horseNumber;
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this.amount = amount;
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}
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@Override
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public String toString() {
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return "Bet{" +
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"betName='" + betName + '\'' +
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", horseNumber=" + horseNumber +
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", amount=" + amount +
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'}';
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}
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}
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}
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@@ -127,7 +127,7 @@ NOTE: per [the official blog post announcement](https://blog.codinghorror.com/up
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| 47_Hi-Lo | x | | x | x | x | x | x | x | x | x |
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| 48_High_IQ | x | x | x | | | | x | | | x |
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| 49_Hockey | x | | x | | | | x | | | x |
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| 50_Horserace | x | | x | | | | | | x | x |
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| 50_Horserace | x | x | x | | | | | | x | x |
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| 51_Hurkle | x | x | x | | | x | x | x | x | x |
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| 52_Kinema | x | x | x | | | x | x | x | | x |
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| 53_King | x | | x | | | | x | | x | x |
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