first commit

2025-11-26 13:56:55 +01:00
commit c5f25901e1
188 changed files with 52799 additions and 0 deletions
--- a/24-09-2025/Opgaver.java
+++ b/24-09-2025/Opgaver.java
@@ -0,0 +1,144 @@
+import java.util.Scanner;
+
+public class Opgaver {
+
+    public static void main(String[] args) {
+        Opgave1.opgave1();
+        Scanner console = new Scanner(System.in);
+        Opgave2.opgave2(console);
+        Opgave3.printBogstaver("Julemanden var sej");
+        sOpgave4.printFaktorer(24);
+        Opgave5.quadratic(console);
+    }
+}
+
+class Opgave1 {
+
+    public static void opgave1() {
+        System.out.println("\n OPGAVE 1: \n");
+        for (int i = 0; i <= 13; i++) {
+            System.out.println("i = " + i);
+            omregnKarakter(i);
+        }
+    }
+
+    public static void omregnKarakter(int karakter) {
+        String nyeKarakter;
+        String gamleKarakter = Integer.toString(karakter);
+        if (karakter == 11 || karakter == 13) {
+            nyeKarakter = "12";
+        } else if (karakter == 10) {
+            nyeKarakter = "10";
+        } else if (karakter == 8 || karakter == 9) {
+            nyeKarakter = "7";
+        } else if (karakter == 7) {
+            nyeKarakter = "4";
+        } else if (karakter == 6) {
+            nyeKarakter = "02";
+        } else if (karakter == 5 || karakter == 03) {
+            nyeKarakter = "00";
+            gamleKarakter = "03";
+        } else if (karakter == 0) {
+            nyeKarakter = "-3";
+            gamleKarakter = "00";
+        } else {
+            System.out.println("Ugyldig karakter indtastet");
+            return;
+        }
+        System.out.println(
+            "Karakteren " +
+                gamleKarakter +
+                " i 13-skalaen svarer til " +
+                nyeKarakter +
+                " i 7-trinsskalaen"
+        );
+    }
+}
+
+class Opgave2 {
+
+    public static void opgave2(Scanner console) {
+        System.out.print("How many numbers do you want to enter? ");
+        int numbersCount = console.nextInt();
+        System.out.print("Number 1: ");
+        int smallestNumber = console.nextInt();
+        int largestNumber = smallestNumber;
+        for (int i = 2; i <= numbersCount; i++) {
+            System.out.print("Number " + i + ": ");
+            int nextNumber = console.nextInt();
+            largestNumber = (nextNumber > largestNumber)
+                ? nextNumber
+                : largestNumber;
+            smallestNumber = (nextNumber < smallestNumber)
+                ? nextNumber
+                : smallestNumber;
+        }
+        System.out.println(
+            "Smallest: " + smallestNumber + "\nLargest: " + largestNumber
+        );
+    }
+}
+
+class Opgave3 {
+
+    public static void printBogstaver(String inputStreng) {
+        if (inputStreng == "") {
+            throw new IllegalArgumentException("Fejl: Fået tomt input");
+        }
+        System.out.print(inputStreng.charAt(0));
+        for (int i = 1; i < inputStreng.length(); i++) {
+            System.out.print(" _ " + inputStreng.charAt(i));
+        }
+        System.out.println("");
+    }
+}
+
+class Opgave4 {
+
+    public static void printFaktorer(int n) {
+        if (n <= 0) {
+            throw new IllegalArgumentException(
+                "Fejl: n skal være et positivt heltal"
+            );
+        }
+        System.out.print(1);
+        for (int i = 2; i <= n; i++) {
+            if (n % i == 0) {
+                System.out.print(" _ " + i);
+            }
+        }
+        System.out.println("");
+    }
+}
+
+class Opgave5 {
+
+    public static void quadratic(Scanner console) {
+        System.out.print("Indtast værdien for a: ");
+        double a = console.nextDouble();
+        System.out.print("Indtast værdien for b: ");
+        double b = console.nextDouble();
+        System.out.print("Indtast værdien for c: ");
+        double c = console.nextDouble();
+        double determinant = (b * b) - (4 * a * c);
+        if (a == 0) {
+            if (b == 0) {
+                throw new IllegalArgumentException("Både a og b er nul");
+            }
+            System.out.println("Roden er: " + (-c / b));
+            return;
+        } else if (determinant < 0) {
+            throw new IllegalArgumentException(
+                "Determinanten kan ikke være negativ"
+            );
+        }
+        double rod1 = (-b - Math.sqrt(determinant)) / (2 * a);
+        double rod2 = (-b + Math.sqrt(determinant)) / (2 * a);
+
+        System.out.println(
+            (rod1 != rod2)
+                ? "Første rod: " + rod1 + "\nAnden rod: " + rod2
+                : "Roden: " + rod1
+        );
+    }
+}