計算1+1/3+1/5+1/7+1/9+.......+1/21的值

package com.Summer_0424.cn;

/**
 * @author Summer
 * 計算1+1/3+1/5+1/7+1/9+.......+1/21
 *
 */
public class Test08 {

    public static void main(String[] args) {
        double sum = 0.0;
        for (int i = 1; i <= 21; i+=2) {
            sum = sum + 1.0/i;//因為i為整數，計算結果為整數，所以用1.0
        }
        System.out.println(sum);
    }

}