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#include <iostream>
using namespace std;
 
class zylinder
{
public:
	double h, R, r, V, M, O;
	double pi = 3.14;
 
	void volumen()
	{
		V = pi*R*R*h - pi*r*r*h;
		cout << "volumen betraegt: " << V << endl;
	}
	void mantelfläche()
	{
		M = 2 * pi*(R + r)*h;
		cout << "mantelflaeche betraegt: " << M << endl;
	}
	void oberfläche()
	{
		O = 2 * pi*(R + r)*(R - r + h);
		cout << "oberflaeche betraegt: " << O << endl;
	}
	zylinder(void);
};
int main()
{
	double h, R, r;
	cout << "hoehe eingeben: ";
	cin >> h;
	cout << endl;
	cout << "aussenradius eingeben: ";
	cin >> R;
	cout << endl;
	cout << "innenradius eingeben: ";
	cin >> r;
	cout << endl;
	double b = R - r; // wanddicke berechnen
	cout << "wanddicke betraegt: " << b << endl;
	cout << endl;
	zylinder myzylinder;
	myzylinder.volumen();
	zylinder myzylinder2;
	myzylinder2.mantelfläche();
	zylinder myzylinder3;
	myzylinder3.oberfläche();
 
 
 
 
	system("pause");
}

Main.java:1: error: illegal character: '#'
#include <iostream>
^
Main.java:1: error: class, interface, or enum expected
#include <iostream>
         ^
Main.java:6: error: illegal start of type
public:
      ^
Main.java:6: error: ';' expected
public:
       ^
Main.java:7: error: <identifier> expected
	double h, R, r, V, M, O;
	        ^
Main.java:13: error: not a statement
		cout << "volumen betraegt: " << V << endl;
		                                  ^
Main.java:18: error: not a statement
		cout << "mantelflaeche betraegt: " << M << endl;
		                                        ^
Main.java:23: error: not a statement
		cout << "oberflaeche betraegt: " << O << endl;
		                                      ^
Main.java:25: error: <identifier> expected
	zylinder(void);
	             ^
Main.java:27: error: class, interface, or enum expected
int main()
^
Main.java:30: error: class, interface, or enum expected
	cout << "hoehe eingeben: ";
	^
Main.java:31: error: class, interface, or enum expected
	cin >> h;
	^
Main.java:32: error: class, interface, or enum expected
	cout << endl;
	^
Main.java:33: error: class, interface, or enum expected
	cout << "aussenradius eingeben: ";
	^
Main.java:34: error: class, interface, or enum expected
	cin >> R;
	^
Main.java:35: error: class, interface, or enum expected
	cout << endl;
	^
Main.java:36: error: class, interface, or enum expected
	cout << "innenradius eingeben: ";
	^
Main.java:37: error: class, interface, or enum expected
	cin >> r;
	^
Main.java:38: error: class, interface, or enum expected
	cout << endl;
	^
Main.java:39: error: class, interface, or enum expected
	double b = R - r; // wanddicke berechnen
	^
Main.java:40: error: class, interface, or enum expected
	cout << "wanddicke betraegt: " << b << endl;
	^
Main.java:41: error: class, interface, or enum expected
	cout << endl;
	^
Main.java:42: error: class, interface, or enum expected
	zylinder myzylinder;
	^
Main.java:43: error: class, interface, or enum expected
	myzylinder.volumen();
	^
Main.java:44: error: class, interface, or enum expected
	zylinder myzylinder2;
	^
Main.java:45: error: class, interface, or enum expected
	myzylinder2.mantelfl?che();
	^
Main.java:46: error: class, interface, or enum expected
	zylinder myzylinder3;
	^
Main.java:47: error: class, interface, or enum expected
	myzylinder3.oberfl?che();
	^
Main.java:52: error: class, interface, or enum expected
	system("pause");
	^
Main.java:53: error: class, interface, or enum expected
}
^
30 errors

Standard output is empty