FibonacciIterative.cpp

#include <iostream>

using namespace std;

int fibonacci(int n) {
  int last = 0;
  int curr = 1;
  for (int index = 0; index < n; ++index) {
    int temp = curr;
    curr += last;
    last = temp;
  }
  return last;
}

int main() { cout << fibonacci(12) << endl; }