poj1517 模拟

/*
Time:2019.11.8
Author: Goven
type：模拟 
err:
ref:
*/
#include<iostream>

using namespace std;

int main()
{
    printf("n e\n- -----------\n0 1\n1 2\n2 2.5\n");
    double e = 2.5;
    int jc = 2;
    for (int i = 3; i < 10; i++) {
        jc *= i;
        e += 1.0 / jc;
        printf("%d %.9lf\n", i, e);
    }
    
    return 0;
}