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***[http://www.cplusplus.com/reference/iostream/ostream/ cplusplus] I/O stream
***[http://publib.boulder.ibm.com/infocenter/comphelp/v101v121/index.jsp?topic=/com.ibm.xlcpp101.aix.doc/legacy/id00058.html IBM] output flags
***[http://en.allexperts.com/q/C-1040/Undefined-reference-linking.htm allexperts.com] good explanation directive
**C, C++ Tips
***[http://www.ros.org/wiki/CppStyleGuide ros.org]