Multiply By seven [closed]

Question

I was asked this interview question: what is the quickest way to multiply a number by 7. she told me not to use any of the + , - , * , / operators. In tense,i could not answer the question.

I know the quickest way to multiply a number by 8 is n<<3 but can n*7 be acheived?

Answer 1

Assuming your compiler isn't terrible, n*7.