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

Posted 2021-05-20 Aiden (winner)

#include <stdio.h>
#include <math.h>
double pi(int n){
	double s=0.0;
	int i;
	for(i=1;i<=n;i++){
		s=s+1.0/(i*i);
	}
	return sqrt(6*s);//返回pi，pi*pi=6*s，pi=sqrt(6*s)
}
void main(){
	int n;
	printf("请输入项数：");
	scanf("%d",&n);
	printf("前%d项关于pi的近似值为：%lf",n,pi(n));
}