求和：1+1/2-1/3+1/4-1/5……+1/n

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package com.jnwork;import java.util.Scanner;public class Sum {/** * 1+1/2-1/3+1/4-1/5……+1/n求和 */public static void main(String[] args) {Scanner sc = new Scanner(System.in);System.out.println("请输入一个正整数N值：");int n=sc.nextInt();double sum=0;String data="";for (int i = 1; i <=n; i++) {if(i==1){sum=1;data=data+1;}else{if(i%2==1){data=data+("-1/")+i;sum=sum-1.0/i;}else{data=data+("+1/")+i;sum=sum+1.0/i;}}}System.out.println(data+"="+sum);}}

package com.jnwork;import java.util.Scanner;/* * 1+1/2+1/3+1/4+......+1/n求和 */public class Sum2 {public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入正整数n："); int n = sc.nextInt();        double sum = 0;        for (int i = 1; i <= n; i++) {            sum += (double) 1 / i;        }        System.out.println("和为："+sum);    }}

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