this post was submitted on 20 Jun 2021
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What is the purpose of 'using namespace std' in C++? (lemmy.ml)
submitted 3 years ago by the_tech_beast@lemmy.ml to c/cpp@lemmy.ml
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cross-posted from: https://lemmy.ml/post/70930

I am learning C++ and in my book using namespace std is written in every program. I understand that std::cout <<"hello"; can be simply written as cout << "hello"; by using namespace std.

Why?

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[–] DubioserKerl@feddit.de 1 points 1 year ago* (last edited 1 year ago)

Correct. While using the namespace saves some time when writing (and some space when printing), it may lead to excess time used debugging later when a name clash happens.

The last point might not be a concern for small "toy programs" used for educational purposes. It is still bad style and should be avoided, especially for toy programs used for educational purposes, though.