/**
  * @author  monika heiner
  * @version 1.0
  * @date 23.04.2012
  * @class ProcDemo1
  */

import java.util.Scanner;
class ProcDemo1 {

// wiederholte alternative Berechnung von Kugel- oder Würfelvolumen
// mit parameterlosen Prozeduren
public static void main(String[] args) { 
	
	System.out.println(".. begin of ProcDemo1 ..");
	
	Scanner in = new Scanner(System.in);
	char key;
	String nextKey;
		
	loop: while (true) {
		printMenue();
		nextKey  = in.next();
		key = nextKey.charAt(0);

		switch (key) {
			case 'k': case 'K': kugel(); break;
			case 'w': case 'W': wuerfel(); break;
			case 'e': case 'E': break loop;
			default : System.out.println("Was wollen Sie???"); 
		} // switch key
	} // while (true)
	
    System.out.println("\n.. end of ProcDemo1 ..");
	
} // main 


static void printMenue() {
	System.out.println("\nWas wollen Sie berechnen?");
	System.out.println("  Kugelvolumen (K)");
	System.out.println("  Wuerfelvolumen (W)");
 	System.out.println("  Exit (E)");
} // printMenue


static void kugel() {
	// Vereinbarungen
	Scanner in = new Scanner(System.in);
	final double PI = 3.14;
	int i; 		// input -> Radius, besser: int radius;
	double v;	// output -> Volumen, besser: double volumen;
	
	// E-V-A
	System.out.println("radius:");
	i = in.nextInt();
	v = i*i*i*PI*4/3;
	System.out.println("  -> Volumen = "+v);
} // kugel
	
	
static void wuerfel() {
	// Vereinbarungen
	Scanner in = new Scanner(System.in);
	int i;		// input -> Radius, besser: int kante;
	double v;	// output -> Volumen, besser: double volumen;
	
	// E-V-A
	System.out.println("kantenlaenge:");
	i = in.nextInt();
	v = i*i*i;
	System.out.println("  -> Volumen = "+v);
} // wuerfel


} // ProcDemo1