Skip to content

Instantly share code, notes, and snippets.

@d630

d630/Playground1.java

Last active April 17, 2018 21:22
Show Gist options
  • Save d630/c52ee9dbfd8a9e3931730e2d3aa9b3f8 to your computer and use it in GitHub Desktop.
Save d630/c52ee9dbfd8a9e3931730e2d3aa9b3f8 to your computer and use it in GitHub Desktop.
Download ZIP
Uebungsaufgaben
Raw
README.md 
 1  Auftragsentwicklung

 2  Schaltjahr

 3  Variablen vertauschen

 4  Kassensystem erstellen

 5  Benzin

 6  Benzin2

 7  1oder2 (while)

 8  Schleife Werte addieren (for und while)

 9  Ganzteil

10  Rabatt

11  Rechner (switch)

12  Kleinste Zahl in einem Array finden

13  Array mit Schleife füllen

14  Getränke Automat

15  Lotto (+)

16  Algorithmus analysieren und implementieren (+)

17  Zahlen zwischen 2 einzugebenden Werten ausgeben

18  Kindergeld berechnen

19  1x1 (Matrix)

20  Methode tauschen()

21  Rechteck Methoden()

22  Multiplikation als Addition und Division als Subtraktion()

23  Lebensdauer und Sichtbarkeit

24  Palindrom (+)

25  Array'n Scanner
Raw
Playground10.java
import java.util.Scanner;
public class Playground10 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
double value;
double rabatt = 0;
System.out.print("Einkaufswert: ");
value = sc.nextDouble();
if (value >= 5000) {
rabatt = value * 0.075;
} else if (value >= 1000) {
rabatt = value * 0.05;
} else if (value >= 100) {
rabatt = value * 0.025;
}
System.out.println("Rabatt: " + rabatt + "\nPreis: " + (value - rabatt));
}
}
// vim: set ts=2 sw=2 tw=0 et :
Raw
Playground11.java
import java.util.Scanner;
public class Playground11 {
public static void main(String[] args) {
int i0;
int i1;
int ergeb = -1;
String op = "";
Scanner sc = new Scanner(System.in);
System.out.print("zahl_1: ");
i0 = sc.nextInt();
System.out.print("zahl_2: ");
i1 = sc.nextInt();
System.out.print("operator (+,-,/,*): ");
op = sc.next();
switch (op) {
case "+":
ergeb = i0 + i1;
break;
case "-":
ergeb = i0 - i1;
break;
case "/":
if (i1 != 0) {
ergeb = i0 / i1;
} else
{
System.out.println("Error: DIV/0");
}
break;
case "*":
ergeb = i0 * i1;
}
System.out.println("Ergebnis: " + ergeb);
}
}
// vim: set ft=java :
Raw
Playground12.java
public class Playground12 {
public static void main(String[] args) {
int [] arr = {45,2,8,24,99};
int min = arr[0];
for (int i = 1; i < arr.length; i++) {
if (arr[i] < min) {
min = arr[i];
}
}
System.out.println("min := " + min);
}
}
// vim: set ft=java :
Raw
Playground13.java
import java.util.Scanner;
public class Playground13 {
public static void main(String[] args) {
int nm;
Scanner sc = new Scanner(System.in);
System.out.print("Anzahl der Namen? ");
nm = sc.nextInt();
String[] array = new String[nm];
for (int i = 0; i < array.length; i++) {
System.out.print("Geben Sie den " + (i+1) + ". Namen ein: ");
array[i] = sc.next();
}
System.out.println("Ihre Eingaben waren: ");
for (String e : array) {
System.out.println("\t<" + e + ">");
}
}
}
// vim: set ft=java :
Raw
Playground14.java
// Bei FL bereits gemacht.
Raw
Playground17.java
import java.util.Scanner;
public class Playground17 {
public static void main(String[] args) {
int i0;
int i1;
int start = 0;
int end = 0;
Scanner sc = new Scanner(System.in);
System.out.print("zahl_1: ");
i0 = sc.nextInt();
System.out.print("zahl_2: ");
i1 = sc.nextInt();
if (i0 > i1) {
start = i1;
end = i0;
} else {
start = i0;
end = i1;
}
for (int i = end - 1; i > start; i--) {
System.out.print(i + " ");
}
System.out.println("");
}
}
// vim: set ft=java :
Raw
Playground18.java
import java.util.Scanner;
public class Playground18 {
public static void main(String[] args) {
double inputEinkommen;
double inputKinder;
double summe = 0;
int moneyCol;
Scanner sc = new Scanner(System.in);
// unter 45000; über 45000
double[][] money = {
{ 70, 70 },
{ 130, 70 },
{ 220, 140 },
{ 240, 140}
};
System.out.print("Jahreseinkommen: ");
inputEinkommen = sc.nextDouble();
moneyCol = (inputEinkommen < 45000) ? 0 : 1;
System.out.print("Kinderanzahl: ");
inputKinder = sc.nextDouble();
for (int i = 0; i < inputKinder; i++) {
summe += (i >= money.length) ? money[money.length - 1][moneyCol] : money[i][moneyCol];
}
System.out.println("Ergebnis: " + summe);
}
}
// vim: set ft=java :
Raw
Playground19.java
import java.util.Scanner;
public class Playground19 {
public static void printMatrix(int x) {
int z = 0;
x += 1;
for (int i = 1; i < x; i++) {
for (int j = 1; j < x; j++) {
z++;
System.out.print(z + " ");
}
System.out.println("");
}
}
public static void printMatrixFormatted(int x) {
int z = 0;
x += 1;
for (int i = 1; i < x; i++) {
for (int j = 1; j < x; j++) {
z++;
System.out.printf("%3d ", z);
}
System.out.println("");
}
}
public static void printMatrixFormatted2(int x) {
int z = 0;
int s;
x += 1;
Scanner sc = new Scanner(System.in);
System.out.print("Sie suchen die Ziffer: ");
s = sc.nextInt();
if (s == 0) {
System.out.println("Error: DIV/0");
return;
}
for (int i = 1; i < x; i++) {
for (int j = 1; j < x; j++) {
z++;
if (z%s == 0) {
System.out.printf("%3s ", "*");
} else {
System.out.printf("%3d ", z);
}
}
System.out.println("");
}
}
public static void main(String[] args) {
printMatrix(10);
System.out.println("");
printMatrixFormatted(10);
System.out.println("");
printMatrixFormatted2(10);
}
}
// vim: set ft=java :
Raw
Playground2.java
// Bei FL bereits gemacht.
Raw
Playground20.java
public class Playground20 {
public static void tauschen(int a, int b) {
System.out.println(b + ", " + a);
}
public static void main(String[] args) {
tauschen(0,1);
}
}
Raw
Playground21.java
public class Playground21 {
private static void berechneFlaeche(double l, double b) {
System.out.println(l*b);
}
private static double berechneUmfang(double l, double b) {
return 2*(l+b);
}
public static void main(String[] args) {
if (args.length < 2) {
System.out.println("Error.");
System.exit(124);
}
double l = Double.parseDouble(args[0]);
double b = Double.parseDouble(args[1]);
berechneFlaeche(l, b);
System.out.println(berechneUmfang(l, b));
}
}
// vim: set ts=2 sw=2 tw=0 et :
Raw
Playground22.java
public class Playground22 {
public static int dividiere(int x, int y) {
if (y == 0) {
System.out.println("Error: DIV/0");
System.exit(124);
}
int r = 0;
int sign = 1;
while (x >= 0) {
x -= y;
r++;
}
return (r - 1) * sign;
}
public static int multipliziere(int x, int y) {
int r = 0;
int sign = 1;
if (x < 0) {
x = -x;
sign = -sign;
}
if (y < 0) {
y = -y;
sign = -sign;
}
for (int i = 1; i <= x; i++) {
r += y;
}
if (sign < 0) {
return -r;
} else {
return r;
}
}
public static void main(String[] args) {
System.out.println(multipliziere(-4, 7));
System.out.println(dividiere(-4, 4));
}
}
// vim: set ts=2 sw=2 tw=0 et :
Raw
Playground23.md

max():

- factor ist sichtbar

- arg ist nicht sichtbar

- n ist nicht sichtbar

- y ist nicht sichtbar

- a ist lokal

- b ist lokal

compute():

- factor ist sichtbar

- arg ist nicht sichtbar

- n ist nicht sichtbar

- x ist lokal

- y ist lokal

main():

- factor ist sichtbar

- arg ist lokal

- n ist lokal
Raw
Playground24.java
public class Playground24 {
public static boolean isPalindrom(String str) {
StringBuilder sb = new StringBuilder();
for (char e : str.toCharArray()) {
sb.insert(0, Character.toString(e));
}
return (str.equals(sb.toString()));
}
public static void main(String[] args) {
if (args.length == 0) {
System.out.println("Error: arg please");
System.exit(123);
}
if (isPalindrom(args[0])) {
System.out.println("yes");
} else {
System.out.println("no");
}
}
}
// vim: set ts=2 sw=2 tw=0 et :
Raw
Playground25.java
public class Playground25 {
public static void main(String[] args) {
int nm;
String name;
Scanner sc = new Scanner(System.in);
System.out.print("Anzahl der Namen? ");
nm = sc.nextInt();
String[] array = new String[nm];
for (int i = 0; i < array.length; i++) {
System.out.print("Geben Sie den " + (i+1) + ". Namen ein: ");
array[i] = sc.next();
}
for (int i = 0; i < array.length; i++) {
System.out.print("Wie lautet der " + (i+1) + ". Name?\nName: ");
name = sc.next();
if (! name.equals(array[i])){
System.out.println("falsch!\nSie haben verloren");
return;
}
}
}
}
// vim: set ft=java :
Raw
Playground3.java
public class Playground3 {
public static void main(String[] args) {
int i0 = 0;
int i1 = 0;
int buf;
if (args.length >= 2) {
i0 = Integer.parseInt(args[0]);
i1 = Integer.parseInt(args[1]);
};
System.out.println(i0 + " " + i1);
buf = i0;
i0 = i1;
i1 = buf;
System.out.println(i0 + " " + i1);
}
}
// vim: set ft=java :
Raw
Playground5.java
public class Playground5 {
public static void main(String[] args) {
double km = 0.0;
double liter = 0.0;
Scanner sc = new Scanner(System.in);
if (args.length >= 2) {
km = Double.parseDouble(args[0]);
liter = Double.parseDouble(args[1]);
} else {
System.out.print("Kilometer: ");
km = sc.nextDouble();
System.out.print("Literverbrauch: ");
liter = sc.nextDouble();
}
System.out.println("Durchschittlicher Literverbrauch auf 100 km: " + liter*100/km);
}
}
// vim: set ft=java :
Raw
Playground6.java
import java.util.Scanner;
public class Playground6 {
public static void main(String[] args) {
double km = 0.0;
double liter = 0.0;
Scanner sc = new Scanner(System.in);
if (args.length >= 2) {
km = Double.parseDouble(args[0]);
liter = Double.parseDouble(args[1]);
} else {
System.out.print("Kilometer: ");
km = sc.nextDouble();
System.out.print("Literverbrauch: ");
liter = sc.nextDouble();
}
if (km <= 0) {
System.out.println("Error:Kilometeranzahl muss >0 sein.");
} else {
System.out.println("Durchschittlicher Literverbrauch auf 100 km: " + liter*100/km);
}
}
}
// vim: set ft=java :
Raw
Playground7.java
import java.util.Scanner;
public class Playground7 {
public static void main(String[] args) {
int i = 0;
int err = 0;
Scanner sc = new Scanner(System.in);
System.out.println("Zahlenspiel.");
while (true) {
System.out.print("Wählen sie aus zwischen: \n\ta) 1\n\tb) 2\nEingabe: ");
i = sc.nextInt();
System.out.print("Sie haben " + i + " eingegeben.");
if (i != 1 && i != 2) {
System.out.println(" Nochmal!");
err++;
} else {
System.out.println("");
break;
}
}
System.out.println("Sie hatten " + err + " Fehlversuche. Bye-bye.");
}
}
// vim: set ft=java :
Raw
Playground8.java
public class Playground8 {
public static void floop () {
int summe = 0;
for (int i = 1; i < 100; i++) {
summe += i;
System.out.print(i + " + ");
}
System.out.println(100 + " = " + (summe + 100));
}
public static void wloop() {
int summe = 1;
String trenn = " + ";
StringBuilder ausgabe = new StringBuilder();
ausgabe.append(summe);
int i = 2;
while (i < 101) {
summe += i;
ausgabe.append(trenn).append(i);
i++;
}
ausgabe.append(" = " + summe);
System.out.println(ausgabe);
}
public static void main(String[] args) {
floop();
wloop();
}
}
// vim: set ft=java :
Raw
Playground9.java
import java.util.Scanner;
public class Playground9 {
public static void main(String[] args) {
int i0;
int i1;
Scanner sc = new Scanner(System.in);
System.out.print("Gib den Dividenden ein: ");
i0 = sc.nextInt();
System.out.println("Sie haben " + i0 + " eingegeben");
System.out.print("Gib den Divisor ein: ");
i1 = sc.nextInt();
System.out.println("Sie haben " + i1 + " eingegeben");
System.out.println("Das Ergebnis der Division " + i0 + ":" + i1 + " ist " + i0/i1 + " Rest " + i0%i1);
}
}
// vim: set ft=java :
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment