HDOJ-1012 u Calculate e（水）

http://acm.hdu.edu.cn/showproblem.php?pid=1012

简单套公式

# include <stdio.h>

double Factorial(double num)
{
	if(num == 0 || num == 1)
		return 1;
	return Factorial(num - 1) * num;
}

int main ()
{
	double Ans[11];
	int i;

	printf("n e\n- -----------\n0 1\n1 2\n2 2.5\n");

	Ans[2] = 2.5;
	for(i = 3; i <= 9; i++)
	{
		Ans[i] = Ans[i - 1] + (1 / Factorial(i));
		printf("%d %.9lf\n",i, Ans[i]);
	}

	return 0;
}