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for example if I were to write std::cout<<"Hello\n"; without having #include<iostream>, what can I do just from the terminal to find out that I need iostream?

Operative
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    Unless someone wrote manpages for C++, you can't. You'd normally look it up in a reference, like http://cppreference.com – Cubic Apr 18 '14 at 17:30
  • If you're using an IDE like Netbeans, you can press CTRL and click the text `cout` and it will take you to either it's declaration or its definition (at least that works on windows). Otherwise you should use cppreference.com, which is a great resource. –  Apr 18 '14 at 17:40
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    @Cubic: You think someone hasn't? http://stackoverflow.com/a/4896547/103167 And then `apropos` or `man -k` commands should help find the right page. – Ben Voigt Apr 18 '14 at 17:52

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iostream is a library which contains command cout. cout will not work without it. so it will be an error of compiler which says why this command does not work. if you are using gcc or g++ compiler it will write the error in your terminal. I hope this info was useful

sharabarati
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