杭电OJ 1012 u Calculate e

#include <iostream>
using namespace std;
int main()
{
	cout << "n e" << endl;
	cout << "- -----------" << endl;
	double sum = 1.0;
	cout << 0 << " " << 1 << endl;
	for (int i = 1; i <= 9; i++)
	{
		int mul = 1;
		for (int j = i; j > 0; j--)
			mul *= j;
		sum += 1 / (double)mul;
		cout << i << " ";
		if (i<=2)
			cout << sum<< endl;
		else
		{
			printf("%.9f\n", sum);
		}
	}
	return 0;
}