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85
.gitignore vendored
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# Created by https://www.toptal.com/developers/gitignore/api/java,c
# Edit at https://www.toptal.com/developers/gitignore?templates=java,c
### C ###
# Prerequisites
*.d
# Object files
*.o
*.ko
*.obj
*.elf
# Linker output
*.ilk
*.map
*.exp
# Precompiled Headers
*.gch
*.pch
# Libraries
*.lib
*.a
*.la
*.lo
# Shared objects (inc. Windows DLLs)
*.dll
*.so
*.so.*
*.dylib
# Executables
*.exe
*.out
*.app
*.i*86
*.x86_64
*.hex
# Debug files
*.dSYM/
*.su
*.idb
*.pdb
# Kernel Module Compile Results
*.mod*
*.cmd
.tmp_versions/
modules.order
Module.symvers
Mkfile.old
dkms.conf
### Java ###
# Compiled class file
*.class
# Log file
*.log
# BlueJ files
*.ctxt
# Mobile Tools for Java (J2ME)
.mtj.tmp/
# Package Files #
*.jar
*.war
*.nar
*.ear
*.zip
*.tar.gz
*.rar
# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
hs_err_pid*
replay_pid*
# End of https://www.toptal.com/developers/gitignore/api/java,c

97
Vorbereitungen/Konto.java
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import java.util.Scanner;
public class Konto {
static double kontostand;
static Scanner scanner;
private static boolean isInt(String input) {
try {
Integer.parseInt(input);
} catch (NumberFormatException nfe) {
return false;
}
return true;
}
private static void showBalance() {
System.out.printf("Kontostand: %f", kontostand);
}
private static void deposit() {
System.out.printf("Bitte geben Sie an, wie viel Geld sie einzahlen möchten: ");
String userInput;
while (true) {
userInput = scanner.nextLine();
if (isInt(userInput)) {
Double.parseDouble(userInput);
break;
} else {
System.out.println("Bitte geben Sie eine ganze Zahl ein.");
}
}
double cleanUserInput = Double.parseDouble(userInput);
kontostand += cleanUserInput;
}
private static void withdraw() {
System.out.printf("Bitte geben Sie ein, wie viel Sie abheben möchten: ");
String userInput;
while (true) {
userInput = scanner.nextLine();
if (isInt(userInput)) {
Double.parseDouble(userInput);
break;
} else {
System.out.println("Bitte geben Sie eine ganze Zahl ein.");
}
double cleanUserInput = Double.parseDouble(userInput);
if (cleanUserInput > kontostand) {
System.out.println("Der eingegebene Betrag ist größer als der Kontostand.");
return;
}
kontostand -= cleanUserInput;
}
}
private static void menu() {
System.out.println("1. Kontostandanzeige");
System.out.println("2. Einzahlung");
System.out.println("3. Auszahlung");
System.out.println("4. Verlassen");
System.out.printf("Eingabe: ");
String userInput;
while (true) {
userInput = scanner.nextLine();
if (isInt(userInput)) {
Integer.parseInt(userInput);
break;
} else {
System.out.println("Bitte geben Sie eine ganze Zahl ein.");
}
}
int cleanUserInput = Integer.parseInt(userInput);
while (true) {
switch (cleanUserInput) {
case 1:
showBalance();
break;
case 2:
deposit();
break;
case 3:
withdraw();
break;
case 4:
System.out.println("Verlassen...");
System.exit(0);
}
}
}
public static void main(String[] args) {
kontostand = 0;
scanner = new Scanner(System.in);
menu();
}
}

2
Vorbereitungen/MonteCarlo/manifest.txt
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Main-Class: vorbereitungen.MonteCarlo.MonteCarlo

52
Vorbereitungen/MonteCarlo/src/vorbereitungen/MonteCarlo/MonteCarlo.java
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package vorbereitungen.MonteCarlo;
import java.util.Scanner;
public class MonteCarlo {
public static void main(String args[]) {
Scanner scanner = new Scanner(System.in);
System.out.println("Enter how many attempts you want to run:");
String attempts = scanner.nextLine();
try {
int num_attempts = Integer.parseInt(attempts);
} catch(NumberFormatException nfe) {
System.out.println("Invalid input.");
scanner.close();
System.exit(1);
return;
}
int num_attempts = Integer.parseInt(attempts);
System.out.println("Enter how large the initial bankroll should be:");
String bankroll = scanner.nextLine();
try {
int num_bankroll = Integer.parseInt(bankroll);
} catch(NumberFormatException nfe) {
System.out.println("Invalid input.");
scanner.close();
System.exit(1);
return;
}
int num_bankroll = Integer.parseInt(bankroll);
System.out.println("Enter the Betsize you want to use for this simulation:");
String betsize = scanner.nextLine();
try {
int num_betsize = Integer.parseInt(betsize);
} catch(NumberFormatException nfe) {
System.out.println("Invalid input.");
scanner.close();
System.exit(1);
return;
}
int num_betsize = Integer.parseInt(betsize);
scanner.close();
Simulation simulation = new Simulation(num_attempts, num_bankroll, num_betsize);
simulation.run();
}
}

67
Vorbereitungen/MonteCarlo/src/vorbereitungen/MonteCarlo/Simulation.java
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package vorbereitungen.MonteCarlo;
import java.util.concurrent.ThreadLocalRandom;
public class Simulation{
int max_attempts;
int current_attempts;
double starting_bankroll;
double current_bankroll;
double simulated_betsize;
public Simulation(int max_atts, int bankroll, double betsize) {
this.max_attempts = max_atts;
this.current_attempts = 1;
this.starting_bankroll = bankroll;
this.current_bankroll = bankroll;
this.simulated_betsize = betsize;
}
public static int roll() {
return ThreadLocalRandom.current().nextInt(1, 8);
}
public static double calculate(int player_roll, int dealer_roll) {
int diff = dealer_roll - player_roll;
if (diff >= 1) {return 0;}
else if (diff == 0) {return 1;}
else if (diff == -6) {return 2;}
else {return 1.5;}
}
public void handle() {
if (this.simulated_betsize > this.current_bankroll) {
System.out.println("|===Out of money===|");
System.out.printf("|Attempts: %d |\n", this.current_attempts);
System.out.println("===================|");
System.exit(2137);
}
this.current_bankroll -= this.simulated_betsize;
int player_roll = roll();
int house_roll = roll();
double mult = calculate(player_roll, house_roll);
this.current_bankroll += this.simulated_betsize*mult;
this.current_attempts++;
}
public void print_progress() {
double bankroll_percentage = (this.current_bankroll/this.starting_bankroll)*100;
double attempt_percentage = (this.current_attempts/this.max_attempts)*100;
System.out.printf("\033[2J"); // Clear screen
System.out.println("|===========|");
System.out.printf("|Current Attempt: %d/%d|\n", this.current_attempts, this.max_attempts);
System.out.printf("|Current Bankroll: %f|\n", this.current_bankroll);
System.out.printf("|%f%% left of starting bankroll\n|", bankroll_percentage);
System.out.printf("|%f%% done|", attempt_percentage);
System.out.println("|===========|");
}
public void run(){
for (int i = 0; i < max_attempts; i++) {
handle();
if (this.current_attempts % 7500 == 0 || this.current_attempts == 1) {
print_progress();
}
}
}
}

58
Vorbereitungen/SieveOfErathostenes.java
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import java.util.Arrays;
import java.util.Scanner;
public class SieveOfErathostenes {
private static void isValid(String input) {
if (input == null) {System.exit(-1);}
try {
Integer.parseInt(input);
} catch (NumberFormatException nfe) {
System.out.println("Die eingegebene Zahl ist keine ganze Zahl");
System.exit(-1);
}
int cleanInput = Integer.parseInt(input);
if (cleanInput < 2 || cleanInput > 1000) {
System.out.println("Die eingegebene Zahl muss mindestens 2 sein und höchstens 1000 sein.");
System.exit(-1);
}
}
private static void printArray(boolean[] arr) {
for (int i = 0; i < arr.length; i++) {
if (arr[i]) {
System.out.printf("%d ", i + 2);
}
}
System.out.printf("%n");
}
public static void main(String[] args) {
//System.out.println("Sanity Check");
Scanner input_scanner = new Scanner(System.in);
System.out.println("Bitte gib eine Zahl ein. ");
String user_input = input_scanner.nextLine();
input_scanner.close();
isValid(user_input);
int clean_input = Integer.parseInt(user_input);
boolean[] primes = new boolean[clean_input];
Arrays.fill(primes, true);
for (int i = 1; i < clean_input; i++) {
if (i == 1) {continue;}
if (primes[i]) {
for (int j = 2; j < clean_input; j++) {
int tmp = j*i;
if (tmp > clean_input) {
break;
}
primes[tmp - 2] = false;
}
}
}
primes[clean_input - 1] = false;
printArray(primes);
}
}