杭电1012—u Calculate e

Problem Description：

A simple mathematical formula for e is



where n is allowed to go to infinity. This can actually yield very accurate approximations of e using relatively small values of n.

Output：

Output the approximations of e generated by the above formula for the values of n from 0 to 9. The beginning of your output should appear similar to that shown below.

Sample Output：

n e - -----------

0 1

1 2

2 2.5

3 2.666666667

4 2.708333333

#include
using namespace std;
int main(){
	cout<<"n e"<= 3) printf("%d %.9lf\n",i,e);
	}
	return 0;
}