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 even-valued terms.

-피보나치 설명 블라블라
- Generate 2 value A,B
-A,B는 매번 새 값 넣어줘야함 (전값,더한값)
- A<=4,000,000 
    항 자체가 숫자넘지않도록
    (bellow는 미만이지만 do not exceed는 이하 )
- if A%2==0
-B가아닌 A를 검토하고 더하는이유: 어차피 B값은 A값으로 대입하게 되있으니깐

A,B,even_sum=1,2,0

while A<=4000000 :
    if A%2==0:
        even_sum+=A
    A,B=B,A+B

정답

 

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