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Merge pull request exercism#675 from dawcars/bowling-exercise
bowling: add to track
2 parents b4c3383 + b9e6499 commit 4e721cd

6 files changed

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‎config.json‎

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]
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},
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{
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"slug": "bowling",
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"difficulty": 6,
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"topics": [
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]
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},
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{
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"slug": "anagram",
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"difficulty": 7,

‎exercises/bowling/build.gradle‎

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apply plugin: "java"
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apply plugin: "eclipse"
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apply plugin: "idea"
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repositories {
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mavenCentral()
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}
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dependencies {
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testCompile "junit:junit:4.12"
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}
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test {
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testLogging {
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exceptionFormat = 'full'
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events = ["passed", "failed", "skipped"]
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}
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}

‎exercises/bowling/src/example/java/BowlingGame.java‎

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import java.util.ArrayList;
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import java.util.List;
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public class BowlingGame {
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private static final int NUMBER_OF_FRAMES = 10;
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private static final int MAXIMUM_FRAME_SCORE = 10;
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private List<Integer> rolls = new ArrayList<Integer>();
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public void roll(int pins) {
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rolls.add(pins);
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}
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public int score() {
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int score = 0;
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int frameIndex = 0;
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for (int i = 1; i <= NUMBER_OF_FRAMES; i++) {
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if (rolls.size() <= frameIndex) {
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throw new IllegalStateException("Score cannot be taken until the end of the game");
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}
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if (isStrike(frameIndex)) {
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if (rolls.size() <= frameIndex + 2) {
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throw new IllegalStateException("Score cannot be taken until the end of the game");
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}
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int strikeBonus = strikeBonus(frameIndex);
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if (strikeBonus > MAXIMUM_FRAME_SCORE && !isStrike(frameIndex + 1)) {
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throw new IllegalStateException("Pin count exceeds pins on the lane");
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}
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score += 10 + strikeBonus;
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frameIndex += i == NUMBER_OF_FRAMES ? 3 : 1;
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} else if (isSpare(frameIndex)) {
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if (rolls.size() <= frameIndex + 2) {
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throw new IllegalStateException("Score cannot be taken until the end of the game");
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}
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score += 10 + spareBonus(frameIndex);
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frameIndex += i == NUMBER_OF_FRAMES ? 3 : 2;
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} else {
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int frameScore = frameScore(frameIndex);
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if (frameScore < 0) {
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throw new IllegalStateException("Negative roll is invalid");
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} else if (frameScore > 10) {
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throw new IllegalStateException("Pin count exceeds pins on the lane");
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}
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score += frameScore;
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frameIndex += 2;
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}
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}
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if (!correctNumberOfRolls(frameIndex)) {
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throw new IllegalStateException("Cannot roll after game is over");
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}
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return score;
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}
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private boolean correctNumberOfRolls(int frameIndex) {
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return frameIndex == rolls.size();
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}
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private boolean isStrike(int frameIndex) {
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return rolls.get(frameIndex) == MAXIMUM_FRAME_SCORE;
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}
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private boolean isSpare(int frameIndex) {
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return rolls.get(frameIndex) + rolls.get(frameIndex + 1) == MAXIMUM_FRAME_SCORE;
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}
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private int strikeBonus(int frameIndex) {
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return rolls.get(frameIndex + 1) + rolls.get(frameIndex + 2);
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}
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private int spareBonus(int frameIndex) {
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return rolls.get(frameIndex + 2);
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}
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private int frameScore(int frameIndex) {
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return rolls.get(frameIndex) + rolls.get(frameIndex + 1);
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}
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}

‎exercises/bowling/src/main/java/.keep‎

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