java编写程序:取π的近似值

Question

编写程序，利用数列π = 4(1-1/3+1/5 - 1/7+1/9-1/11-1/13…)来取得π的近似值，直到最后一项的值小于10-6 为止

Answer 1

代码如下：（答题不易，还请博友采纳！）

public class CalculatePi {
    public static void main(String[] args) {
        double pi = 0;
        double term = 1;
        int sign = 1;
        int denominator = 1;

        while (Math.abs(term) >= 1e-6) {
            pi += sign * term;
            denominator += 2;
            sign = -sign;
            term = 1.0 / denominator;
        }

        pi *= 4;

        System.out.println("π的近似值为: " + pi);
    }
}