Constants

        sub PI () { 3 } 

• Now you can use PI and get 3:

        $circum = 2 * PI * $r;

• PI is read-only:

        PI = 3;

        Can't modify constant item in scalar assignment at ...

• () enables special function-call syntax

• This incantation also enables inlining optimization

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Copyright © 2003 M. J. Dominus