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