How do I code this problem in C++ ? Please post the code and an explanation of each line of code. I am stuck! Thank you

Even Fibonacci numbers Problem 2 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