'Size was not declared in this scope' C++ Part 2, Arrays, 4*

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Here, check this answer:

#include query for SIZE

Ok I found the video. I think std::size() would not work for those arrays. You can use int second[sizeof(first) / sizeof(first[0])]; This would assign the same size to the second array. No extra header files are needed. If it is a different size() implementation, then mention the video so that I can look up for it. I checked that the implementation is correct. Check compiler version of Code::Blocks. It should be C++17 or higher. If the version is C++17 and it is still not working, then …