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;

}