compus1.cpp:1: invalid suffix on floating constant compus1.cpp:1: parse error before numeric constant In file included from /usr/include/c++/3.2.2/backward/iostream.h:31, from compus1.cpp:4: /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. In file included from /usr/include/c++/3.2.2/iosfwd:45, from /usr/include/c++/3.2.2/ios:44, from /usr/include/c++/3.2.2/ostream:45, from /usr/include/c++/3.2.2/iostream:45, from /usr/include/c++/3.2.2/backward/iostream.h:32, from compus1.cpp:4: /usr/include/c++/3.2.2/bits/stringfwd.h:55: parse error before `<' token /usr/include/c++/3.2.2/bits/stringfwd.h:58: confused by earlier errors, bailing out