u Calculate e

Description

A simple mathematical formula for e is
e=Σ0<=i<=n1/i!

where n is allowed to go to infinity. This can actually yield very accurate approximations of e using relatively small values of n.
Input

No input
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 Input

no input
Sample Output

n e


0 1
1 2
2 2.5
3 2.666666667
4 2.708333333
...

http://blog.csdn.net/chinaczy/article/details/4891859