Java开发中循环的应用

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); }