C++ Files
The following are all C++ files:
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helloworld.cpp
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helloworld.c
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helloworld.cp
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helloworld.cxx
Notice that .cpp, .c, .cp, and .cxx are all valid extensions for C++ files.
(.cpp is the most common)
The following are all C++ header files:
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iostream.h
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iostream.hpp
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iostream.hxx
(.h is the most common extension)