#!/usr/bin/perl
use strict;
use warnings;

#USAGE: ./alvin.pl 6 3

my $init_popsize = $ARGV[0] - 1;
my $maxtime      = $ARGV[1];

my @age;
my @gender;
my @weight;
my @population = ( 0 .. $init_popsize );

for my $i ( 0 .. $#population ) {
    $age[$i] = int( rand(10) );    #Alter
    my $r1 = rand();
    if ( $r1 <= 0.4 ) {            #Geschlecht (0=männlich, 1=weiblich)
        $gender[$i] = 0;
    }
    else {
        $gender[$i] = 1;
    }
    my $r2 = rand();
    if ( $r2 <= 0.3 ) {            #Gewicht
        $weight[$i] = 0;
    }
    elsif ( $r2 > 0.3 && $r2 <= 0.6 ) {
        $weight[$i] = 1;
    }
    else {
        $weight[$i] = 2;
    }
    printf "$age[$i] $gender[$i] $weight[$i]\n";
}
printf "\n";

Aussen: for my $t ( 1 .. $maxtime ) {

  Innen: for my $i ( 0 .. $#population ) {

        $age[$i]++;

        if ( $age[$i] >= 10 ) {
            splice( @age,        $i, 1 );
            splice( @weight,     $i, 1 );
            splice( @gender,     $i, 1 );
            splice( @population, $i, 1 );

            # $age[$i]++;
            next Innen;
        }
    }

    for my $i ( 0 .. $#population ) {

        printf "$age[$i] $gender[$i] $weight[$i]\n";
    }
    my $population = $#population + 1;
    printf "\npopulation: $population\n";
}

$i = 5.5;
print "$i unformatiert\n";
printf "%2.5f formatiert\n", $i;