Why are the braces around $_[0] in function STORE? 
package Cents;
sub TIESCALAR { bless \my $self, shift }
sub STORE     { ${$_[0]} = $_[1] }
sub FETCH     { sprintf "%.02f", ${ my $self = shift} }


package main;
tie $bucks, "Cents";

$bucks = 45.00;
print "$bucks\n";

$bucks *= 1.0715;
print "$bucks\n";

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In reply to what does the brace do by pglenski

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