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  1. or download this
    use bugnum;
    say log(0.5);
    
  2. or download this
    ...
    
    ...
    $x->bclog2();           # log2($x) rounded up to nearest int
    $x->bclog10();          # log19($x) rounded up to nearest int
    ...
    
  3. or download this
    tab@music4:~/Pianoforte/Perlmonks 21:54:45 $ cat !$
    cat 11156670.pl
    ...
    tab@music4:~/Pianoforte/Perlmonks 21:54:51 $ ./11156670.pl 
    Log of .5 is -0.693147180559945
    tab@music4:~/Pianoforte/Perlmonks 21:54:57 $