ProjectEulerOctave/Problem2.m

function [] = Problem2()
%ProjectEuler/Octave/Problem2.m
%Matthew Ellison
% Created: 03-28-19
%Modified: 10-28-20
%The sum of the even Fibonacci numbers less than 4,000,000
%{
	Copyright (C) 2020  Matthew Ellison

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Lesser General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with this program.  If not, see <https://www.gnu.org/licenses/>.
%}


	%Setup your Variables
	fib = [1, 1, 2];	%Holds the Fibonacci numbers
	currentFib = fib(end) + fib(end - 1);	%The current Fibonacci number to be tested
	evenFib = [2];	%A subset of the even Fibonacci numbers

	%Start the timer
	startTime = clock();

	while(currentFib < 4000000)
		%Add the number to the list
		fib(end + 1) = currentFib;
		%If the number is even add it to the even list as well
		if(mod(currentFib, 2) == 0)
			evenFib(end + 1) = currentFib;
		end

		%Set the next Fibonacci
		currentFib = fib(end) + fib(end - 1);
	end

	%Stop the timer
	endTime = clock();

	%Print the results
	printf("The sum of all even Fibonacci numbers less than 4000000 is %d\n", sum(evenFib))
	printf("It took %f seconds to run this algorithm\n", etime(endTime, startTime))
end

%{
Results:
The sum of all even Fibonacci numbers less than 4000000 is 4613732
It took 0.000694 seconds to run this algorithm
%}