单项选择题
A.0个 B.0个或1个 C.0个或多个 D.1个或多个
A.iostream.h B.fstream.h C.iomanip.h D.stdlib.h
A.inta，&ra=a，&&ref=ra B.int&refa[10] C.inta，&ra=a，&*refp=&ra D.int*pi，*&pref=pi