import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;


interface Plottable {

	double function(double x);
	double getA();
	double getB();
}


class Plott implements Plottable
{
	private double a;
	private double b;
	
	@Override
	public double function(double x) {
		// TODO Auto-generated method stub
		return (x*x)+5;
	}

	//GEt and Set A
	public void setA(double a){
		this.a=a;
	}
	@Override
	public double getA() {
		return a;
	}

	
	//Get and Set B
	public void setB(double b){
		this.b=b;
	}
	@Override
	public double getB() {
		// TODO Auto-generated method stub
		return b;
	}
	
	
	
}

class Hauptroutine
{
	public static void main(String[]args)
	{
		 Plott Gnuplot = new Plott();
		 System.out.println("Geben sie die Intervallgrenzen a und b ein!");
		 Gnuplot.setA( Input.in.readDouble());
		 Gnuplot.setB(Input.in.readDouble());
		 
		 System.out.println("Geben sie die Zahl der Intervalle n ein (positive ganze Zahl!)");
		 int n = Input.in.readInteger();
		 System.out.println("Unter welchem Dateinamen wollen sie die Daten speichern?");
		 String filename = Input.in.readString();
		 
		 createData(filename,Gnuplot,n);
	
	}
	
	public static void createData(String filename,Plottable p,int n)
	{
		double aktuell = p.getA();
		double schrittweite  = (p.getA()+p.getB())/n;
		
	
			try
			{
				File f = new File("/home/mosfet/eclipse/workspace/Aufgabe40/src/"+ filename + ".data");
				
				if(!f.canWrite() || !f.createNewFile())
					{
						System.out.println("Kann Datei nicht schreiben!");
						System.exit(1);
					}
			
				else
					{
					while(aktuell != p.getB())
					{
						DataOutputStream out = new DataOutputStream(new FileOutputStream(f));
						PrintStream s = new PrintStream(out);
						s.println(aktuell+ " " + p.function(aktuell));
						s.close();
						aktuell = aktuell + schrittweite ;
					}//Ende while
					}
			
			}//Ende Try
			
			catch(IOException e)
			{ System.out.println(e);}
	
		
		
	}//Ende create Data	
}//Ende Klasse