杭电acm--1012



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.

#include<stdio.h>#include<stdlib.h>#include<iostream>#include<cmath>#include<iomanip>//#define P 3.141592653using namespace std;int function(int k){if (k == 0 || k == 1)return 1;elsereturn k*function(k - 1);}void main(){double arr[10],sum=0;cout << 'n' << ' ' << 'e' << endl;cout << '-' << ' ' << "-----------" << endl;for (int i = 0; i < 10; i++){arr[i] = 1.0 / function(i);sum += arr[i];if (i == 0 || i == 1)cout << i << ' ' << fixed << setprecision(0) << sum << endl;else if (i == 2)cout << i << ' ' << fixed << setprecision(1) << sum << endl;elsecout << i << ' ' <<fixed<<setprecision(9)<< sum<< endl;}system("pause");}