杭电 1012 u Calculate e

这一题，真是觉得很郁闷，改了又改；最后勉强通过了。

总觉得它的题目很不标准，一开始那几个示例，让我产生了“数字后面不能有零”的感觉。结果当然是错了。百度一下，才知道然后有零也可以，唉，真是……

/* THE PROGRAM IS MADE BY PYY */

/*----------------------------------------------------------
  http://acm.hdu.edu.cn/showproblem.php?pid=1012
  u Calculate e
  Begin : 14:00
  End   : 15:21
  ----------------------------------------------------------*/

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
        int i, factor[10], precision;
        double sum = 0;
        factor[0] = 1;
        for (i = 1; i < 10; i++) {
                factor[i] = i * factor[i - 1];
//                cout << factor[i] << endl;
        }

        cout << "n e/n"
             << "- -----------/n"
             << "0 1/n"
             << "1 2/n"
             << "2 2.5/n";
        sum = 2.5;
        for (i = 3; i < 10; i++) {
                sum += 1.0/factor[i];
                cout << i << " " << setprecision(9) << fixed << sum << endl;
        }

        return 0;
}