g++ -o firstcc.o -Wall first.cpp
In file included from /usr/lib/gcc/i686-pc-linux-gnu/3.4.3/include/g++-v3/backward/iostream.h:31,
from first.cpp:1:
/usr/lib/gcc/i686-pc-linux-gnu/3.4.3/include/g++-v3/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <iostream> instead of the deprecated header <iostream.h>. To disable this warning use -Wno-deprecated.