计算(pi*pi)/6=1+1/(2*2)+1/(3*3)+…+1/(n*n)关于pi的近似值

以下是两种计算(pi*pi)/6=1+1/(2*2)+1/(3*3)+…+1/(n*n)关于pi的近似值的方法：

1. Java实现：

public class PiApproximation {
    public static double calculatePi(int n) {
        double s = 0.0;
        for (int i = 1; i <= n; i++) {
            s += 1.0 / (i * i);
        }
        return Math.sqrt(6 * s);
    }

    public static void main(String[] args) {
        int n = 1000000;
        double pi = calculatePi(n);
        System.out.println("The approximation of pi is: " + pi);
    }
}

2. C语言实现：

#include <stdio.h>
#include <math.h>

double calculatePi(int n) {
    double s = 0.0;
    for (int i = 1; i <= n; i++) {
        s += 1.0 / (i * i);
    }
    return sqrt(6 * s);
}

int main() {
    int n = 1000000;
    double pi = calculatePi(n);
    printf("The approximation of pi is: %lf\n", pi);
    return 0;
}