In file included from /usr/include/c++/3.2.2/backward/fstream.h:31, from numar.cpp:3: /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. numar.cpp: In function `long int f(long int)': numar.cpp:17: `cout' undeclared (first use this function) numar.cpp:17: (Each undeclared identifier is reported only once for each function it appears in.) numar.cpp: At global scope: numar.cpp:65: `main' must return `int' numar.cpp:65: return type for `main' changed to `int' numar.cpp: In function `int main(...)': numar.cpp:65: `endl' undeclared (first use this function) numar.cpp:97: return-statement with no value, in function declared with a non-void return type