Application of loop in Java development

As shown in the figure above, the addition is implemented. It can be implemented in two ways;

One: subtract even numbers and add odd numbers.

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);

	}

Another one: set a symbol and let its symbol change with the cycle.

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);
	}

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