update printf/suche/rechner

sources/src/main/java/pr2/auffrischung/printf/DoubleFormatter.java

@@ -1,18 +1,47 @@
 package pr2.auffrischung.printf;
 
+import java.text.DecimalFormat;
+import java.text.NumberFormat;
+
 public class DoubleFormatter {
 
     public static void printDouble(double d) {
-        // TODO: Wert ausgeben
+        String format = "0.000";
+        NumberFormat formatter = new DecimalFormat(format);
+        String newD = formatter.format(d);
+        System.out.print("Mit Formatting: " + newD);
+        System.out.println();
     }
 
     public static void main(String[] args) {
-        printDouble(1.0);
+        double dVal1 = 1.0;
-        printDouble(10.1);
+        printDouble(dVal1);
-        printDouble(2.01);
+        System.out.printf("Mit printf: %.3f", dVal1);
-        printDouble(2.001);
+        System.out.println();
-        printDouble(2.0001);
+        double dVal2 = 10.1;
-        printDouble(2.0004);
+        printDouble(dVal2);
-        printDouble(2.0005);
+        System.out.printf("Mit printf: %.3f", dVal2);
+        System.out.println();
+        double dVal3 = 2.01;
+        printDouble(dVal3);
+        System.out.printf("Mit printf: %.3f", dVal3);
+        System.out.println();
+        double dVal4 = 2.001;
+        printDouble(dVal4);
+        System.out.printf("Mit printf: %.3f", dVal4);
+        System.out.println();
+        double dVal5 = 2.0001;
+        printDouble(dVal5);
+        System.out.printf("Mit printf: %.3f", dVal5);
+        System.out.println();
+        double dVal6 = 2.0004;
+        printDouble(dVal6);
+        System.out.printf("Mit printf: %.3f", dVal6);
+        System.out.println();
+        double dVal7 = 2.0005;
+        printDouble(dVal7);
+        System.out.printf("Mit printf: %.3f", dVal7);
+        System.out.println();
+        
     }
 }

sources/src/main/java/pr2/auffrischung/suchemax/GroessteZahl.java

@@ -5,8 +5,17 @@ public class GroessteZahl {
     public int sucheMax(int[] zahlen) {
         int max = 0;
 
-        // TODO: Methode implementieren
+        for (int i = 0; i < zahlen.length; i++) {
+            if (max > zahlen[i]) {
+                max = zahlen[i];
+            }
+        }
+        for (int i = 0; i < zahlen.length; i++) { 
+            if (max < zahlen[i]) {
+                max = zahlen[i];
+            }
             
+        }   
         return max;
     }
 

sources/src/main/java/pr2/auffrischung/taschenrechner/Taschenrechner.java

@@ -3,16 +3,34 @@ package pr2.auffrischung.taschenrechner;
 public class Taschenrechner {
 
     public double rechne(double o1, char op, double o2) {
-        // TODO: Implementieren
+
+        switch (op) {
+        case '+':
+            return o1 + o2;
+        case '-':
+            return o1 - o2;
+        case '*':
+            return o1 * o2;
+        case '/':
+            if (o2 == 0) {
+                return o2;
+            } else {
+                return o1 / 02;    
+            }        
+        case '^':
+            return Math.pow(o1, o2);
+        default:
             return 0.0;
         }
         
+    }
+
     public static void main(String[] args) {
         Taschenrechner t = new Taschenrechner();
         System.out.println(t.rechne(1, '+', 2));
         System.out.println(t.rechne(1, '-', 2));
         System.out.println(t.rechne(2, '*', 2));
         System.out.println(t.rechne(4, '/', 2));
-        System.out.println(t.rechne(2, '^', 32));
+        System.out.println(t.rechne(2, '^', 3));
     }
 }