In file included from /usr/include/c++/3.2.2/backward/iostream.h:31, from div3.cpp:2: /usr/include/c++/3.2.2/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 <sstream> instead of the deprecated header <strstream.h>. To disable this warning use -Wno-deprecated. div3.cpp:5: `main' must return `int' div3.cpp:5: return type for `main' changed to `int'