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Hannes
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<?xml version="1.0" encoding="UTF-8"?>
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<fileset-config file-format-version="1.2.0" simple-config="true" sync-formatter="false">
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<fileset name="all" enabled="true" check-config-name="Programmieren_Assignment06_WS_2015" local="false">
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<file-match-pattern match-pattern="." include-pattern="true"/>
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</fileset>
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</fileset-config>
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@@ -0,0 +1,6 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>
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@@ -0,0 +1,17 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>Assignment6A_EulerApproximation</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>
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@@ -0,0 +1,11 @@
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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
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org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
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org.eclipse.jdt.core.compiler.compliance=1.8
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org.eclipse.jdt.core.compiler.debug.lineNumber=generate
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org.eclipse.jdt.core.compiler.debug.localVariable=generate
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org.eclipse.jdt.core.compiler.debug.sourceFile=generate
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org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
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org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
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org.eclipse.jdt.core.compiler.source=1.8
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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="false">
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<output url="file://$MODULE_DIR$/bin" />
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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</content>
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<orderEntry type="sourceFolder" forTests="false" />
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<orderEntry type="jdk" jdkName="JavaSE-1.8" jdkType="JavaSDK" />
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</component>
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</module>
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@@ -0,0 +1,72 @@
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package edu.kit.informatik;
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/**
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* The Enum Command.
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*
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* @author Hannes Kuchelmeister
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* @version 1.0
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*/
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public enum Command {
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/** set command. */
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SET("set", 1),
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/** quit command. */
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QUIT("quit", 0),
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/** invalid command. */
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INVALID("", -1);
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/** The command. */
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private final String command;
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/** The param count. */
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private final int paramCount;
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/**
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* Instantiates a new command.
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*
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* @param command
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* the command
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* @param paramCount
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* the param count
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*/
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private Command(final String command, final int paramCount) {
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this.paramCount = paramCount;
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this.command = command;
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}
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/**
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* Gets the command.
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*
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* @return the command
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*/
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public String getCommand() {
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return command;
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}
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/**
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* Gets the param count.
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*
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* @return the param count
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*/
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public int getParamCount() {
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return paramCount;
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}
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/**
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* converts string to command.
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*
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* @param str
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* the str
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* @return the command
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*/
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public static Command convertToCommand(final String str) {
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for (final Command command : Command.values()) {
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if (command.getCommand().equals(str)) {
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return command;
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}
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}
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return INVALID;
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}
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}
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package edu.kit.informatik;
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/**
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* The Class CommandLineParser.
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*
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* @author Hannes Kuchelmeister
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* @version 1.0
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*/
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public class CommandLineParser {
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private static final String COMMAND_NOT_FOUND = "not valid command. Use: 'set <n>', 'quit'";
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private static final String WRONG_PARAMETER_COUNT = "the command expects %d parameter";
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private boolean readyToQuit;
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/**
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* Instantiates a new command line parser.
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*/
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public CommandLineParser() {
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readyToQuit = false;
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}
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/**
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* Runs the command line parser
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*/
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public void run() {
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while (!readyToQuit) {
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runCommand(Terminal.readLine());
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}
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}
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private void runCommand(final String command) {
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if (command == null) {
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error(COMMAND_NOT_FOUND);
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return;
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}
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final String[] arr = command.split("[\\s]");
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String[] parameters;
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if (arr.length > 1) {
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parameters = arr[1].split("[\\,]");
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} else {
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parameters = new String[0];
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}
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switch (Command.convertToCommand(arr[0])) {
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case QUIT:
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if (parameters.length != Command.QUIT.getParamCount()) {
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error(String.format(WRONG_PARAMETER_COUNT, Command.QUIT.getParamCount()));
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} else {
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readyToQuit = true;
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}
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break;
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case SET:
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if (parameters.length != Command.SET.getParamCount()) {
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error(String.format(WRONG_PARAMETER_COUNT, Command.QUIT.getParamCount()));
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} else {
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set(parameters);
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}
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break;
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default:
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error(COMMAND_NOT_FOUND);
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break;
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}
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}
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private void set(final String[] param) {
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try {
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final int n = Integer.parseInt(param[0]);
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final double rounded = Math.ceil(Eulerapproximator.calcEuler(n) * 1000.0) / 1000.0;
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Terminal.printLine(Double.toString(rounded));
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} catch (final NumberFormatException e) {
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error("set expects <n> where n is a number as parameter");
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} catch (final IllegalNumberException e) {
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error(e.getMessage());
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}
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}
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private void error(final String str) {
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Terminal.printLine("Error, " + str);
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}
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}
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@@ -0,0 +1,47 @@
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package edu.kit.informatik;
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/**
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* The Class Eulerapproximator.
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*
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* @author Hannes Kuchelmesiter
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* @version 1.0
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*/
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public final class Eulerapproximator {
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private static final String NOT_NATURAL = "the number is not a natural number";
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private Eulerapproximator() {
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}
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/**
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* Calculates eulers number.
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*
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* @param n
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* the n
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* @return the double
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* @throws IllegalNumberException
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* the illegal number exception
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*/
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public static double calcEuler(final int n) throws IllegalNumberException {
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// Check if n is natural number
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if (n < 0) {
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throw new IllegalNumberException(NOT_NATURAL);
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}
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final double tmp = 1.0 / faculty(n);
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if (n == 0) {
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return tmp;
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} else {
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return calcEuler(n - 1) + tmp;
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}
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}
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private static double faculty(final int n) {
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assert n >= 0;
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if (n == 0) {
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return 1;
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} else {
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return faculty(n - 1) * n;
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}
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}
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}
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package edu.kit.informatik;
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/**
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* The Class IllegalNumberException.
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*
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* @author Hannes Kuchelmeister
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* @version 1.0
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*/
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public class IllegalNumberException extends Exception {
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/**
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* Instantiates a new illegal number exception.
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*/
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public IllegalNumberException() {
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super();
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}
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/**
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* Instantiates a new illegal number exception.
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*
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* @param message
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* the message
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*/
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public IllegalNumberException(final String message) {
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super(message);
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}
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}
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package edu.kit.informatik;
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/**
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* The Class Main.
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*
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* @author Hannes Kuchelmeister
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* @version 1.0
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*/
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public final class Main {
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/**
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* Instantiates a new main.
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*/
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private Main() {
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}
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/**
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* The main method.
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*
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* @param args
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* the arguments
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*/
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public static void main(final String[] args) {
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final CommandLineParser cParser = new CommandLineParser();
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cParser.run();
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}
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}
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@@ -0,0 +1,67 @@
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package edu.kit.informatik;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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/**
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* This class provides some simple methods for input/output from and to a
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* terminal.
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*
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* Never modify this class, never upload it to Praktomat. This is only for your
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* local use. If an assignment tells you to
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* use this class for input and output never use System.out or System.in in the
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* same assignment.
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*
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* @author ITI, VeriAlg Group
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* @author IPD, SDQ Group
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* @version 4
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*/
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public final class Terminal {
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/**
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* BufferedReader for reading from standard input line-by-line.
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*/
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private static BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
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/**
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* Private constructor to avoid object generation.
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*/
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private Terminal() {
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}
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/**
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* Print a String to the standard output.
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*
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* The String out must not be null.
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*
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* @param out
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* The string to be printed.
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*/
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public static void printLine(final String out) {
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System.out.println(out);
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}
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/**
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* Reads a line from standard input.
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*
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* Returns null at the end of the standard input.
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*
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* Use Ctrl+D to indicate the end of the standard input.
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*
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* @return The next line from the standard input or null.
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*/
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public static String readLine() {
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try {
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return in.readLine();
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} catch (final IOException e) {
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/*
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* rethrow unchecked (!) exception to prevent students from being
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* forced to use Exceptions before they have
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* been introduced in the lecture.
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*/
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throw new RuntimeException(e);
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}
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}
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}
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Reference in New Issue
Block a user