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include iostream Estruct Sys struct templatetypename T void printin(T const arg) const std::cout arg ‘In’; out; ; define package extern auto p Package . define public define class int define Main main(int) define static define void if constexpr (false) define String define args ()return 0; ()); else if constexpr (true define System Sys public class Main public static void main(String args) System.out .printIn("Hello world!");