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;

}