In file included from /usr/include/c++/3.2.2/backward/fstream.h:31, from spam.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. spam.cpp: In function `void det_sol()': spam.cpp:63: warning: assignment to non-pointer type `char' from NULL spam.cpp:63: warning: argument to non-pointer type `char' from NULL spam.cpp:74: warning: assignment to non-pointer type `char' from NULL spam.cpp:74: warning: argument to non-pointer type `char' from NULL spam.cpp:78: warning: assignment to non-pointer type `char' from NULL spam.cpp:78: warning: argument to non-pointer type `char' from NULL spam.cpp:80: warning: assignment to non-pointer type `char' from NULL spam.cpp:80: warning: argument to non-pointer type `char' from NULL spam.cpp:88: warning: assignment to non-pointer type `char' from NULL spam.cpp:88: warning: argument to non-pointer type `char' from NULL