How to pause real time in Perl

Question

I am quite new to Perl and this is my first post here so be gentle.

I am using real time in a countdown timer of 60 seconds and need to be able to stop it every 10 s

Answer 1

Update $end_time after getting the response from the user.

while (1) {
    $countdown--;
    $time = time;
    last if ($time >= $end_time);
    printf("\r%02d:%02d:%02d",
        ($end_time - $time) / (1*60),
        ($end_time - $time) / 60%60,
        ($end_time - $time) % 60,
    );

    sleep(1);
    if ($countdown%10 == 0) {
        print "Continue? ";
        $answer = <>;
        chomp $answer;
        last if $answer ne 'y';
        $end_time = time + $countdown;
    }
}

Answer 2

Use a 10s countdown in a loop executed 6 times.

for my $i (1..6) {
    if ($i != 1) {
        print "\nContinue? ";
        $answer = <>;
        chomp $answer;
        last if !( $answer eq 'y' || $answer eq 'yes' );
    }

    countdown(10);
}

Where countdown is simply the code you posted.

sub countdown {
    my ($length) = @_;

    my $start_time = time;
    my $end_time = $start_time + $length;
    for (;;) {
        my $time = time;
        last if $time >= $end_time;
        printf("\r%02d:%02d:%02d",
            ($end_time - $time) / (1*60),
            ($end_time - $time) / 60%60,
            ($end_time - $time) % 60,
        );

        sleep(1);
    }
}