first commit

Ugesedler/Ugeseddel-3 17-09-2025/src/Main.java

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+import java.util.Arrays;
+import java.util.Scanner;
+
+public class Main {
+    public static void main(String[] args) {
+        /*Opgave1.printNumbers(15);
+        Opgave2.processName();
+        Opgave3.repl("Hello", 3);
+        Opgave4.printPowersOf2(10);
+        Opgave4.printPowersOf2NoMath(10);
+        Opgave5.Opgave5();*/
+        Opgave6.quadratic(1,3,2);
+    }
+}
+
+class Opgave1 {
+    public static void printNumbers(int n) {
+        for (int i = 1; i <= n; i++) {
+            System.out.print("["+i+"] ");
+        }
+        System.out.println();
+    }
+}
+
+class Opgave2 {
+    public static void processName() {
+        Scanner scanner = new Scanner(System.in);
+        System.out.print("\n Skriv dit navn: ");
+        String name = scanner.nextLine();
+        String[] splitName = name.split(" ");
+        System.out.print("Dit navn i omvendt rækkefølge er: "+splitName[splitName.length-1]+", ");
+        for (int i = 0; i <= splitName.length-2; i++) {
+            System.out.print(splitName[i]+" ");
+        }
+        System.out.println();
+    }
+}
+
+class Opgave3 {
+    public static void repl(String input, int n) {
+        for (int i = 1; i <= n; i++) {
+            System.out.print(input);
+        }
+        System.out.println();
+    }
+}
+
+class Opgave4 {
+    public static void printPowersOf2(int n) {
+        for (int i = 0; i <= n; i++) {
+            System.out.print((long)Math.pow(2, i)+" ");
+        }
+        System.out.println();
+    }
+
+    public static void printPowersOf2NoMath(int n) {
+        for (int i = 0; i <= n; i++) {
+            System.out.print(calculatePowerOf2(2, i)+" ");
+        }
+        System.out.println();
+    }
+
+    public static int calculatePowerOf2(int n, int repeat) {
+        if  (repeat == 0) {
+            return 1;
+        } else {
+            return calculatePowerOf2(n, repeat - 1) * n;
+        }
+    }
+}
+
+class Opgave5 {
+    public static void Opgave5() {
+        System.out.printf("%-5s %-15s %-15s %-10s %-10s%n", "Year", "Balance", "Interest", "Deposit", "New Balance");
+        double balance = 1000.0;
+        double interest = 0.065;
+        double deposit = 100;
+        for (int i = 1; i <= 25; i++) {
+            double oldBalance = balance;
+            balance += balance * interest;
+            double newBalance = balance + deposit;
+            System.out.printf("%-5d $%-14.2f $%-9.2f $%-9.2f $%-14.2f%n", i, oldBalance, oldBalance * interest, deposit, newBalance);
+            balance = newBalance;
+        }
+    }
+}
+
+class Opgave6 {
+    public static void quadratic(double a, double b, double c) {
+        double[] x = {0.0,0.0};
+        for (int i = -1; i <= 1; i += 2) {
+            x[(i <= 0 ? 0 : 1)] = (-b-(Math.sqrt(Math.pow(b,2)-(4*a*c))*i))/(2*a);
+        }
+        System.out.println(Arrays.toString(x));
+    }
+}