What does =+ mean in C?

Question

I came across =+ as opposed to the standard += today in some C code; I\'m not quite sure what\'s going on here. I also couldn\'t find it in the doc

Answer 1

In ancient versions of C, =+ was equivalent to +=. Remnants of it have been found alongside the earliest dinosaur bones. Any more, it has no special meaning -- it's just a = followed by a +.