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I am new to JavaScript and am having trouble getting my code to work. Any help/guidance is greatly appreciated.
I am getting the wrong output (currently “9.715575428267785e+30“) when trying to “displays the sum of first 50 even Fibonacci numbers”
I needed to: 1. create a loop that generates Fibonacci numbers. 2. test each one for whether it's even or odd. 3. Add up up the even ones, counting them as you go.
------------HERE IS MY CODE THUS FAR --------
<div id="sumFib" class="hwbutton">Get the Sum!</div>
The sum of the first 50 even Fibonacci numbers is:
<span class="" id="sumFibResult"></span>
<script>
var getFibSum = document.getElementById("sumFib");
getFibSum.onclick = function () {
fiftyEvenFibonacciSum();
}
function fiftyEvenFibonacciSum() {
var loopFib;
//Initialize fibonacci array
var fibonacci = new Array();
//Add fibonacci array items
fibonacci[0] = 0;
fibonacci[1] = 1;
var sum = 0;
//Since it takes 150 fib numbers to obtain 50 even, loop through that many.
for (loopFib = 2; loopFib <= 150; loopFib++) {
// Next fibonacci number = previous + one before previous
fibonacci[loopFib] = fibonacci[loopFib - 2] + fibonacci[loopFib - 1];
//test for even numbers with if then statement
var integer = parseInt(fibonacci[loopFib]);
if (integer % 2 == 0) {
//Add up the even fib numbers if even and output into dispay variable
var display = sum += fibonacci[loopFib];
//output results to html page
document.getElementById("sumFibResult").innerHTML = display;
}
}
}
</script>
http://jsfiddle.net/isherwood/38gPs
