Monday, July 9, 2007

How to fast multiply a number by 7?

Try


(num << 3 - num)


This is same as


num*8 - num = num * (8-1) = num * 7

24 comments:

Anonymous said...

The first answer is not completely accurate
(num << 3 - num)

Due to order of operations you will get some erroneous data

The corrected format should be
(num << 3)- num

MaJJ said...

it's interesting that you can do it with every (2^x)-1 number - 3, 7, 15, 31...

Anonymous said...

<< precede - so num<<3-num is fine though it is better to do (num << 3) - num for readability.

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