Thread: Fibonacci -- suggestions please

Hello all. I am still pretty new to C++ and I made this Fibonacci sequence thing.

What would you recommend to prevent a segmentation fault if the first to vector elements are not populated, or rather, how would you ensure the first two elements were populated?

Code:

#include <iostream>
#include <vector>
#include <iomanip>

using namespace std;

int main(){
	vector<double> fib;
	double stop = 200;
	double i = 1;

	fib.push_back(1);
	fib.push_back(1);

	while(i++ <= stop)
		fib.push_back(fib[i-1] + fib[i-2]);

	for(i = 0; i < fib.size(); i++)
		cout << setprecision(50) << fib[i] << endl;

	cout << endl;

	return 0;
}

TIA!

I don't know what your question is. If the first two elements aren't populated, you can't do the Fibonacci sequence, so you shouldn't ever get into the situation.

But I suppose you can check that fib.size is at least 2 before trying to do the loop.

I guess what I am really asking is: is that how you would implement it , if there was some way I was missing that the first two values could be filled or a better way the program could be written.

1. It should be an int, it was left over from messing around.

2. I see the logic error in that. i should be 2.

Thanks.