$mask = eval '0b' . ( 1 x $bits ) . ( 0 x ( 32 - $bits ) );

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Or you could have used the function that perl provides for this purpose: 
$mask = oct '0b' . ( 1 x $bits ) . ( 0 x ( 32 - $bits ) );

[download]

In reply to Re: String eval is cool by jwkrahn
in thread String eval is cool by DrHyde

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