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Why u are using namespace and only iostream instead of iostream.h?
2 Respostas
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iostream.h would a c version (and does not exist) if you look in the file system the file is iostream without any extension.
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namespace is used to save typing std::cout and std::endl
you can leave namespace out if you use std::cout everywhere you normally use cout. there are lots of other functions in std name space that would need std:: in front.