#include <stdio.h>
#include <math.h>
double fun ( double eps)
{
double s=1.0,y=1.0;
int j;
for(j=1;y>=eps;j++)
y*=j/(2*j+1),s+=y;
return 2*s;
}
main( )
{ double x;void NONO ();
printf("Input eps:") ;
scanf("%lf",&x); printf("\neps = %lf, PI=%lf\n", x, fun(x));
NONO();
}
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("in.dat","r") ;
wf = fopen("out.dat","w") ;
for(i = 0 ; i < 10 ; i++) {
fscanf(fp, "%lf", &x) ;
fprintf(wf, "%lf\n", fun(x)) ;
}
fclose(fp) ;
fclose(wf) ;
}
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