Operator >>= meaning in C?

Question

I know >> is Binary Right Shift Operator but what does >>= mean, like if I want Log2 on x I need while(x >>= 1) result++;.

This question was already asked, here is the answer : http://stackoverflow.com/a/17769959/4811236 — Clément Béligat, Oct 23 '15 at 14:12
There's nothing particularly interesting about this operator. If you want to think about something funky, consider `while( x --> 0 )`. — Bathsheba, Oct 23 '15 at 14:13
wow.. you're bad people... @Olaf you can't search > in google. -paxdiablo I didn't see it. -Cool_Guy thanks. thanks everybody for the hate. — Mano Mini, Oct 23 '15 at 14:18
@CoolGuy: It is not (exactly). The operand is only evaluated once, thus e.g. side-effects are only generated once, while for the assignment they would be twice. — too honest for this site, Oct 23 '15 at 14:39
@Olaf Didn't knew that! Thanks! Is it the same for all shorthand operators like `-=`, `+=`, `*=` etc? — Spikatrix, Oct 24 '15 at 12:25
@Olaf Umm. Could you tell me which section is it mentioned in? — Spikatrix, Oct 24 '15 at 12:57
@CoolGuy: If your browser doesn't have a search-function, why not start with "assignment operators"? (giving a man a fish vs. teach him fishing ...) — too honest for this site, Oct 24 '15 at 13:07

score 2 · Accepted Answer · answered Oct 23 '15 at 14:09

2

It's the bitwise shift right assignment operator; x >>= 1 is equivalent to x = x >> 1.

(It has the same precedence as assignment =).

answered Oct 23 '15 at 14:09

Bathsheba

1 Answers1