backup

5/Kreisflaeche2.~ava

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+import java.util.Scanner;
+import java.text.DecimalFormat;
+
+public class Kreisflaeche2 {
+  public static DecimalFormat antwortFormat = new DecimalFormat("0.00");
+  public  static void main(String[] args) {
+    
+    Scanner input = new Scanner(System.in);
+    double radius  = 0;
+    boolean ende = false; 
+    System.out.print("Radius: "); 
+    radius = input.nextDouble();
+    System.out.println("Rad = " + radius);
+    
+    
+    while (!ende) { 
+      System.out.println("Was wollen Sie machen?");
+      System.out.println("K, U oder V finden");
+      String wahl = input.next();
+      switch (wahl) {
+        case  "K": 
+          System.out.println("Kreisfläche: " +  antwortFormat.format( kreisflaecheB(radius)));
+          break;
+        case  "U": 
+          System.out.println("Umfang - " + antwortFormat.format( umfang(radius)));
+          break;
+        case  "V":
+          System.out.println("Volumen - " + antwortFormat.format( volumen(radius)));        
+          break;  
+        default:
+          System.out.println("Falsch");
+          ende = true;
+      } 
+      
+    } 
+    
+    
+  }
+  public static double kreisflaecheB( double r) {
+    return (Math.PI * Math.pow(r,2) );    
+  }
+  
+  public static double umfang(double r) {
+    return (2 * r * Math.PI);
+    
+  }  
+  public static double volumen(double r) {
+    return ((4/3)  * Math.PI * Math.pow(r,3));
+    
+  }
+}