Hdoj 2070 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

3
4
5
-1

Sample Output

2
3
5

Hint
Note:

you can use 64bit integer: __int64

Author
Lily

Source
浙江工业大学网络选拔赛

题目分析
斐波那契数列问题，用__int64即可

Code

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<cctype>
#include<cstring> 
#include<cstdlib>
using namespace std;
__int64 a[51];
int main()
{   
    int n;
    cin>>n;
    a[0]=0;a[1]=1;
    for(int i=2;i<=50;i++) a[i]=a[i-1]+a[i-2];
    while(n!=-1)
    {
        cout<<a[n]<<endl;
        cin>>n;
    }
    return 0;
}

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