Fibbonacci Number

Problem Description

Your objective for this question is to develop a program which will generate a fibbonacci number. The fibbonacci function is defined as such:

f(0) = 0
f(1) = 1
f(n) = f(n-1) + f(n-2)

Your program should be able to handle values of n in the range 0 to 50.

 

Input

Each test case consists of one integer n in a single line where 0≤n≤50. The input is terminated by -1.

 

Output

Print out the answer in a single line for each test case.

 

Sample Input

345-1

 

Sample Output

235
Hint
Note:
 you can use 64bit integer: __int64
注意：__int64的用法，以及怎样的输入输出；
#include<iostream>#include<cstdio>using namespace std;int main(){__int64 s[100];int n,i;while(scanf("%d",&n)!=EOF){if(n==-1)break;s[0]=0;s[1]=1;s[2]=1;for(int i=3;i<=n;++i){s[i]=s[i-1]+s[i-2];}printf("%I64d\n",s[n]);}return 0;}