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for (my $i=0;$i<@array;$i++)
{
   $array[$i] = 3; # dummy value
   # do your stuff, $i being the counter
}

foreach (0..@array)
{ 
   $array[$_] = 3;
   # do your stuff, $_ being the counter
}

foreach(@array)
{
   # use $_ as counter
   # do your stuff
}