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Perl in a Nutshell

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hex

hex hexnum

Converts a hexadecimal string hexnum into its equivalent decimal value. If hexnum is omitted, it interprets $_. The following code sets $number to 4,294,906,560:

$number = hex("ffff12c0");
To do the inverse function, use:
sprintf "%lx", $number;   # (That's a letter 'l', not a one.)


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