1012 u Calculate e

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

5 2.716666667

6 2.718055556
7 2.718253968
8 2.718278770
9 2.718281526

 

 #include<stdio.h>
 int jc(int n)
 {
     int i=,s=;
     if(n==||n==)
     return ;
     while(i<=n)
     {
         s*=i;
         i++;
     }
     return s;//计算n！
 }
 int main()
 {
     double a[];
     a[]=;
     for(int i=;i<=;i++)
     {
         a[i]=1.0/jc(i)+a[i-];
     }
     printf("n e\n");
     printf("- -----------\n");
     for(int i=;i<=;i++)
     {
         if(i!=)
         printf("%d %.10g\n",i,a[i]);
         else
         printf("%d %.9f\n",i,a[i]);
     }
     return ;
 }