In file included from /usr/include/c++/3.2.2/backward/iostream.h:31, from nr3.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. nr3.cpp: In function `int main()': nr3.cpp:18: warning: comparison between signed and unsigned integer expressions nr3.cpp:20: warning: comparison between signed and unsigned integer expressions nr3.cpp:26: warning: comparison between signed and unsigned integer expressions nr3.cpp:33: warning: comparison between signed and unsigned integer expressions nr3.cpp:39: warning: comparison between signed and unsigned integer expressions nr3.cpp:41: warning: comparison between signed and unsigned integer expressions nr3.cpp:47: warning: comparison between signed and unsigned integer expressions nr3.cpp:50:2: warning: no newline at end of file