Project Euler . Problem 2 . Even Fibonacci numbers : Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be: 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ... By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the ev…

projecteuler2.js

var TARGETNUM = 4000000;
var i = 0;
var b = 0;
var a = 1;
var answer = 0;
while (true) {
  if (b%2==0) answer = answer + b;
  tmp = b;
  b = a;
  if (TARGETNUM < b) break;
  a = tmp + a;
  i++;
}
console.log(answer);

var sum = 2;
var n = 1;
var sumEven = 0;

while(true) {
if (sum < 4000000) {
sum = sum + n;
n = sum - n;
if (sum % 2 == 0) {
sumEven = sumEven + sum;
}
} else break

}

alert(sumEven);