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%n special: *stores* the number of characters output so far
into the next variable in the parameter list
my $name = ...; ## from user input
my $amount = ...;
# instead of
# printf "%s : \$%.02f\n", $name, $amount;
$name = (" " x 5000) . "%n";
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
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