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***[http://en.allexperts.com/q/C-1040/Undefined-reference-linking.htm allexperts.com] good explanation directive
***[http://www.unknownroad.com/rtfm/gdbtut/gdbsegfault.html gdb] how to debug
***[http://www.opengroup.org/onlinepubs/007908775/xsh/fopen.html Open Group]
**C, C++ Tips
