vault backup: 2023-10-27 19:03:01

SS23/Mathe/Ilias/Zusatz_Material/Cosinus.java

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+//   Cosinus.java
+//   Programm zum Spielen, Ausprobieren und Verbessern
+//   Ziel: "Gute" Berechnung der Cosinus-Funktion
+
+import java.io.*;
+
+public class Cosinus
+{
+   public static double myfak(int k)
+   {
+           double x;
+           if (k==0) {return 1.0;}
+           else {return ((double) k)*myfak(k-1);}
+   }
+   public static double mycos(double x) 
+   {
+        double sum=0.0;
+        double term=0.0;
+        for (int k=0;k<=10;k++) 
+            {
+            term=Math.pow((-1),k)*Math.pow(x,2*k)/myfak(2*k);
+            sum+=term;
+            }
+        return sum;
+    }
+    public static void main(String[] args) throws IOException
+    {
+        double x;
+        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
+        System.out.print("Wie lautet die Stelle x? x = ");
+        x = Double.parseDouble(in.readLine());
+        System.out.println("Meine Rechnung liefert cos(x) = " + mycos(x));
+        System.out.println("Java-Mathe-Bib liefert cos(x) = " + Math.cos(x));
+     }
+}