math - rounding to the nearest zero, bitwise -

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i wonder how can round nearest 0 bitwise? previously, perform long division using loop. however, since number divided number power 2. decide use bit shifting. so, can result this:

12/4=3 13/4=3 14/4=3 15/4=3 16/4=4

can performing long division usual?

12>>2 13>>2

if use kind of bit shifting, behavior different different compiler? how rounding up? using visual c++ 2010 compiler , gcc. thx

bitwise shifts equivalent round-to-negative-infinity divisions powers of two, meaning answer never bigger unrounded value (so e.g. (-3) >> 1 equal -2).

for non-negative integers, equivalent round-to-zero.


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