求派。（二级C语言程序设计题）

#include <stdio.h>
#include <math.h>
double  fun ( double  eps)
{

}

main( )
{ double  x;void NONO ();
  printf("Input eps:") ;
  scanf("%lf",&x); printf("\neps = %lf, PI=%lf\n", x, fun(x));
  NONO();
  getchar();
}

void NONO ()
{/* 本函数用于打开文件，输入数据，调用函数，输出数据，关闭文件。 */
  FILE *fp, *wf ;
  int i ;
  double x ;

  fp = fopen("C:\\WEXAM\\000000000000\\in.dat","r") ;
  wf = fopen("C:\\WEXAM\\000000000000\\out.dat","w") ;
  for(i =  ; i <  ; i++) {
    fscanf(fp, "%lf", &x) ;
    fprintf(wf, "%lf\n", fun(x)) ;
  }
  fclose(fp) ;
  fclose(wf) ;
}

int n=;
    double down=,up=;
    double one,pi=;
    one=(double)up/(double)down;
    while(one>=eps)
    {
        pi+=one;
        n++;
        up=up*n;
        down=down*(*n+);
        one=(double)up/(double)down;
    }
    return pi*;