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Working with headers and structs.

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Hello! I have a struct " struct Point2D { double x; double y; };" and two files "geometry.cpp" and "geometry.h" and I also want a global variable "struct Point2D pixelmod;" But I don't know what to put in the cpp file and what to put in the header file. I tried putting this in the header file " struct Point2D { double x; double y; }; " But since the header is imported several times by other files this gives a multiple definition error. I also tried putting " struct Point2D struct Point2D pixelmod; " in the header but then it complains "two or more data types in declaration of pixelmod" Thaaaanks!

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