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Algorithm

Posted on 1998-09-04
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Last Modified: 2010-03-05
I am looking for an algorithm that will allow you to add up squares and determine the individuals.  OK...that doesn't make much sense.  Here's an example.  There are 4 options.  The values to the options are 1, 2, 4, and 8 respectively.  If the total of the options is 14, what routine would let me know that the 2nd, 3rd, and 4th option were picked?
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Question by:IsleOfView
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4 Comments
 
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Expert Comment

by:ozo
ID: 1204693
$_ = unpack'b*',pack'V',14;
print pos,"\n"  while( /1/g );
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Author Comment

by:IsleOfView
ID: 1204694
That works perfectly.  (I think I need to hit the books to understand the syntax, though) :)

Please choose answer so I can give the points.
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ozo earned 10 total points
ID: 1204695
$_ = unpack'b*',pack'V',14;
print pos,"\n"  while( /1/g );
#or
for( 1..4 ){ print if $_&14 }
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LVL 84

Expert Comment

by:ozo
ID: 1204696
#sorry, that second one should have been
for( 1..4 ){ print if 1<<$_-1 & 14 }
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