#include"head_file.h"
#include<sys/timeb.h>
#include<stdio.h>

int main()
{
	timeb t1, t2;//定义两个变量
	long t;
	double x, sum = 0, sum1=1;
	int i, j, n;
	printf("请输入x n:");
	scanf("%lf %d",&x,&n);
	ftime(&t1);//记录开始的时间
	for (i = 0; i < n; ++i)
	{
		sum1 = sum1*(-1/x);
		sum += sum1;
	}
	ftime(&t2);//记录结束的时间
	t = (t2.time - t1.time) * 1000 + (t2.millitm - t1.millitm);//计算程序运行的时间
	printf("sum is %ld,and time is :%ld\n",sum,t);
	return 0;
}