hdu1012

#include<stdio.h>int main(){    int f[10]={1,1,2,6,24,120,720,5040,40320,362880};    int n;    double e;    printf("n e\n");    printf("- -----------\n");    printf("%d %d\n",0,1);    printf("%d %d\n",1,2);    printf("%d %.1f\n",2,2.5);    e=2.5;    for(n=3;n<=9;n++)    {        e+=1.0/f[n];        printf("%d %0.9f\n",n,e);    }    return 0;}