FAQ: Hello World - Hello World!

This community-built FAQ covers the “Hello World!” exercise from the lesson “Hello World!”.

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Learn C++

FAQs on the exercise Hello World!

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I am just using this as a refresher course as I have now gotten a job that requires a lot of C++.

My question is: Is there a reason why you have excluded the namespace std? When I was in University, the professor told us that using the namespace would make teaching and learning easier.

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Typically it’s because developers don’t want to have conflicts in namespaces by ‘using’ libraries.

This stack overflow post has some good information on it. As the comments point out, if you’re only using a few functions from a library, you can use those specifically instead of prefixing the namespace on the functions.



what does it mean???



"# "is a macro used for preprocessing and “include” is a keyword which tells compiler to include a file.
meaning whatever return with # is preprocessed before the program compilation


//int main()
int is a integer datatype and it should return any value but referring to this lesson there is no such return 0; Also .h is used after headers why it gives error on mentioning .h
cout is object of a class defined in iostream.h , why we have to use std::


I’m use VS Code. This “Hello world” message is not work. VS Code say a error in this message. It’s say "#include " is incorrect. What can I do for now ?

May I ask, what job position is this?