You made some errors, but instead of listing them all, I took your approach and tried to fix it.

You should have told us that it's Euler Problem #2

I took some liberties, especially using unshift and pop (which is kind of optional) facilitated to fix a conceptional bug of yours¹.

Feel free to ask if you have problems understanding.

HTH! :)

PS: @Harangzsolt33 I had no problems calculating for 4e12 or bigger, the limit is rather integer accuracy and not recursion overhead.

#!/usr/bin/perl
use v5.14;
use strict;
use warnings;

my $result  = 0;
my $level   = 2;        # next is F2
my $max_val = 4_000_000;
my $max_rec = 1000;

my $DBG = 1;


fib(1,0);            # F1,F0
print $result;


sub fib
{
    my  @frame = @_;

    #my $DBG = 1;

    unshift @frame, $frame[0] + $frame[1];   # prepend next level Fib 
+(see footnote 1)
    pop @frame;                              # remove tailing Fib (opt
+ional)

    count($frame[0]);

    say "Fib(" . $level++ . ") =  $frame[0]" if $DBG;
    say " ... # \@frame = (@frame)" if $DBG;

    # playing safe with deep recursion    
    die "May recursion $max_rec exceeded" if $level > $max_rec; 

    return fib(@frame) unless($frame[0] >= $max_val);
}

sub count {
    my ($increment) = @_;

    #my $DBG = 1;
    
    if(($increment  % 2) == 0){
    say "adding Fib($level) = $increment to $result" if $DBG;
    $result += $increment;
    }
}

[download]

activating the $DBG flags will show you debug information.

<Reveal this spoiler or all in this thread>

UPDATE

¹) you can also do a list assignment instead of unshift and pop. Your code suffered from timing problems when overwriting.

Cheers Rolf
(addicted to the Perl Programming Language :)
see Wikisyntax for the Monastery

In reply to Re: How am i doing? by LanX
in thread How am i doing? by Anonymous Monk

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