bitwise shift question

Original Post

Jul 11, 2004 at 10:13 PM

is this correct: (x*40) is equal to ((x<<5) + (x<<3)) if not, how to convert to bitwise shifts, multiplications not powers of two? Thanks.

Jul 11, 2004 at 10:19 PM

Yes, assuming x is integral (not float).

EDIT: Now it makes sense!

Jul 11, 2004 at 10:23 PM

Quote:
Original post by _nomad_
((x<<5) + (x<<3))

Break it down:

x << 5 ==> x * 32
x << 3 ==> x * 8

(x * 32) + (x * 8) ==> x * (32 + 8) ==> x * 40