"Unspecified behavior" means something correct will happen, but you don't know what (in that case you can't rely on the execution order). "Undefined behavior" m

"Unspecified behavior" means something correct will happen, but you don't know what (in that case you can't rely on the execution order). "Undefined behavior" means something entirely incorrect may happen (crash or totally unexpected and bad behavior, so the term "nasal daemons" which means dragons coming out of your nose).