Problem 2.py

# Problem 2: Even Fibonacci numbers
# 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.

def fab(num1,num2,sumofnum,result): # Defining the function
    if(sumofnum<4000000): # Check wether number is less than 4 million
        sumofnum = num1 + num2
        if sumofnum%2==0: # Check if number is even or odd
            value.append(sumofnum) # If even append the number
        num1 = num2 # Changing the value of elements
        num2 = sumofnum
        fab(num1,num2,sumofnum,result) # Calling function again
    return sum(value) # Return sum of even fibonacci numbers
value = [2] 
answer = fab(1,2,0,2) # Function call
print(answer) # Print answer or sum of even fibonacci numbers