In file included from /usr/include/c++/3.2.2/backward/iostream.h:31, from fazanr.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. fazanr.cpp: In function `int prima(int)': fazanr.cpp:6: warning: unused variable `int p' fazanr.cpp: At global scope: fazanr.cpp:11: warning: ISO C++ forbids declaration of `main' with no type fazanr.cpp:20:1: warning: no newline at end of file