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## Interview Question

Interview(Student Candidate) Sunnyvale, CA

# Write a function given x, the function returns the xth

number in the Fibonacci sequence.

1

int getNthFib(int n) { // assume n is positive if (n <= 2) return n; int i = 1; int j = 2; int k; count = 2; while (count < n) { k = i + j: count ++; i = j; j = k; } return k;

HappyCoder on Nov 2, 2009
1

I've been asked this question several times at interviews, and it's usually associated with recursion, so the answer most would like to see is like: int getFib(int n) { return n <= 1 ? n : getFib(n - 1) + getFib(n - 2); } The interviewer will also want to know you understand that recursion would be slow for high values of n.

Anonymous on Dec 13, 2009
2

Prior to your next interview, I would also google "tail recursion" and demonstrate how more efficient a tail recursive fibonacci sequence would be.

Anonymous on Dec 14, 2009
0

#include<iostream> using namespace std; int getFib(int n) { if(n==1||n==2) return n; return getFib(n-1)+getFib(n-2); } int main(){ int n=6; cout<<getFib(5)<<endl; system("pause"); return 0; }

HarishIITR on Jan 11, 2012