Anwendung der Schleife in der Java-Entwicklung

public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner con=new Scanner(System.in);
		int n=con.nextInt();
		double m=0.0;
		for(int i=1;i<=n;i++)
		{
			if(i%2==0)
			{m=m-1.0/i;}
			else
			{m=m+1.0/i;}
		}
		System.out.println(m);

	}

public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner con=new Scanner(System.in);
		int n=con.nextInt();
		double m=0.0;
		int f=1;
		for(int i=1;i<=n;i++)
		{
			m=m+f*1.0/i;
			f=-f;
		}
		System.out.println(m);
	}