Question

用JAVA语言编写“ 计算下列级数m(i)=1-1/3+1/5-1/7+1/9-1/11+1/13-....-1/(2i-1)+1/(2i+1)”

高手们，帮帮忙啊`考试用

Answer 1

这个题目知道里很多人都答过的 搜下

Answer 2

import javax.swing.JOptionPane;

public class TestM {
public static void main(String[] args) {
int n = Integer.parseInt(JOptionPane.showInputDialog("输入i(i>=2):"));
int flag = -1;
double sum = 1;
for (int j = 2; j <= n; j++) {
sum += 1.0 / (2 * j - 1) * flag;
flag *= -1;
}
System.out.println("m(" + n + ")=" + sum);
}
}