In file included from /usr/include/c++/3.2.2/backward/fstream.h:31, from scara2.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. scara2.cpp: In function `int main()': scara2.cpp:10: `x' undeclared (first use this function) scara2.cpp:10: (Each undeclared identifier is reported only once for each function it appears in.) scara2.cpp:78:2: warning: no newline at end of file