杭电oj1012

简单题

#include<stdio.h> #include<iostream>#define For(i,m,n) for(i=m;i<n;i++)using namespace std;int main()  {      double a[10];      double sum=1;      int i;      a[0]=1;      For(i,1,10)      {          sum=sum*i;          a[i]=a[i-1]+1/sum;      }        printf("n e\n");    printf("- -----------\n");      For(i,0,10)      {          if(i>2)  printf("%d %.9lf\n",i,a[i]);          else              cout<<i<<" "<<a[i]<<endl;      }      return 0;  }