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# Modifies @array in-place.
foreach (@array) {
   $_ = sprintf($format, $_);
}

# Copies to a second array while formatting.
my @formatted = map { sprintf($format, $_) } @array;

# Same as last, but without using "map".
my @formatted;
for (0..$#array) {
   $formatted[$_] = sprintf($format, $array[$_]);
}

foreach (@formatted) {
   print($_, "\n");
}