test7.c

有关C的训练题

#include "stdio.h"
#include "math.h"
double fun();
void main()
{
	double pi;
	pi=2*fun();
	printf("\b=%lf\n",pi);

	return ;
}

double fun()
{
	double result=1;
	float  i=1;
	double t,t1,t2;
	
	t1=i/(2*i+1);
	i=i+1;
	t2=i/(2*i+1);

	t=t1*t2;
	printf("Reslut=%lf+",result);
	while(fabs(t)>=1e-10)
	{
		printf("%.10lf+",t);
		result+=t;
		i=i+1;
		t=t*i/(2*i+1);
	}
	return result ;

}