求π的值是多少

#include<stdio.h>

#include<math.h>

int main()

{

 int sign=1,m=0;

 double pi=0.0,n=1.0,term=1.0;

 while(fabs(term)>=1e-8)

 {

  pi=pi+term;

  n=n+2;

  sign=-sign;

  term=sign/n;

  m++;

 }

 pi=pi*4;

 printf("pi=%10.8f\n",pi);

 printf("循环%d次\n",m);

 return 0;

}