package com.bigjava.tq;

import java.util.Scanner;

/**

* 求和

* @author zgp

*

*/

public class Summation {

public static void main(String[] args){

System.out.print("请输入一个整数：");

Scanner scan = new Scanner(System.in);

int n = scan.nextInt();

scan.close();

if(n%2==0)

System.out.println("结果："+even(n));

else

System.out.println("结果："+odd(n));

}

//奇数

static double odd(int n){

double sum = 0;

for(int i=1;i<n+1;i+=2){

sum += 1.0/i;

}

return sum;

}

//偶数

static double even(int n){

double sum = 0;

for(int i=2;i<n+1;i+=2){

sum += 1.0/i;

}

return sum;

}

}