欧拉计划 第2题

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 even-valued terms.

 

int a = 1, b = 2;
long result = 2;
while (result < 4000000)
{
    int c = a + b;
    a = b;
    b = c;
    if (c % 2 == 0) result += c;
}
Console.WriteLine(result);