欧拉项目第二题

不知不觉，欧拉项目就零零碎碎的做了15道题了，觉得真是非常的花时间，但是依然还是乐此不彼。下面奉上欧拉项目第二题代码

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? 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, ... Find the sum of all the
?? even-valued terms in the sequence which do not exceed four million.

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? 这道题算法不难，主要点在于审题。可能是我英语不太好吧，开始做了好久都没有做出来，我还以为是我算法出了问题，后来验证了很多遍都没有什么问题。然后仔细去看了下题目， even-valued是什么意思。一看，原来是偶数，顿时恍然大悟。简单的修改了一下代码，即可求得正解。代码如下：

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public class Problem2 {public static void main(String[] args) {long a = 1;long b = 1, c;long sum = 0;while (b < 4000000) {b = a + b;a = b - a;if (a % 2 == 0) {sum += a;}}System.out.println(a);System.out.println(sum);}}