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Help on #includes in C++

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Hi there people! I just started learning C++ (already program in JAVA for 2 years) and I am having hard time figuring out the best way to employ #include's in my codes. It appears everyone puts Class definitions and functions prototypes in header files. That's ok! But when I am about to link, for eg., foo.h and foo.cc to goo.h and goo.cc, Should I include foo.h or foo.cc? And in which goo file (goo.h or goo.cc)? Also I want to know if there are any possible problems of #include'ing the same library many times in a project. For eg., <iostream> in foo.h and the same <iostream> in goo.h.

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