斐波那契非递归算法

斐波那契数列求第n项的非递归算法实现

 1 #include<iostream>
 2
 3 long long Fibonacci(unsigned int n){
 4    if(n<=2)
 5     return n-1;
 6
 7    long long fibNumberOne = 1;
 8    long long fibNumberTwo = 0;
 9    long long fibN = 0;
10    for(unsigned int i = 2;i < n;i++){
11         fibN = fibNumberOne + fibNumberTwo;
12         fibNumberTwo = fibNumberOne;
13         fibNumberOne = fibN;
14    }
15    return fibN;
16 }
17
18 int main(){
19     unsigned int fiboNumber;
20     while(std::cin>>fiboNumber){
21         std::cout<<Fibonacci(fiboNumber)<<std::endl;
22     }
23     return 0;
24 }