Even Fibonacci numbers
AUTHOR
Eric Hodges
https://projecteuler.net/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.
use v6;
my $term = 1;
my $last_term = 0;
my $sum = 0;
while ($term < 4000000) {
($last_term, $term) = ($term, $term + $last_term);
$sum += $term unless $term % 2;
}
say $sum;
# vim: expandtab shiftwidth=4 ft=perl6