A.cout<<"1. "<<setfill(’ ’)<< "Hello! "<<endl; B.cout<<"1."<<’ ’ <<"Hello! \n"; C.cout<<"1. Hello! "<<endl; D.cout<<"1. "<<setw(7)<< "Hello! ";
A.25 25 B.25 31 C.31 19 D.25 19
A.stdlib.h B.iostream.h C.fstream.h D.iomanip.h