In file included from /usr/include/c++/3.2.2/backward/fstream.h:31, from char.cpp:1: /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. char.cpp:4: `int j1' redeclared as different kind of symbol /usr/include/bits/mathcalls.h:239: previous declaration of `double j1(double)'