FAQ: Variables - User Input

This community-built FAQ covers the “User Input” exercise from the lesson “Variables”.

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FAQs on the exercise User Input

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When do we include “return 0;” and when is it okay to omit it?


What is the purpose of the return 0?

1 Like

Why are we always creating a new line with “\n” when there is nothing happening with that new line after? Is it a good habit to have?


Hello hh1077,

We use -return- for return a value from a function, in this case the function is -main- that returns zero value -return 0;-, but you will understand this point when you take the “functions” topic, don’t worry about that.



The program didn’t output anything when I typed in my tip. The machine says my code works but still nothing is outputted:

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You forgot to put a ; at the end of your last line of code. Like this:

std::cout << “You paid” << tip << “dollars\n”;

What did I do wrong? My code matches the example, but it will not run correctly.

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#include <iostream>

int main() {
  int tip = 0;
  std::cout << "Enter tip amount: ";
  std::cin >> tip;
  std::cout << "you paid " << tip <<"dollars.\n";

any one know why this isnt working for me

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I had the same problem “Bash: X: command not found”. Doesn’t make sense.

Might be a bug because when it gave me the solution, I had the exact same code but this time it worked.

Update: I copied and pasted their solution and it failed with the same error. I did it right, the tutorial is broken.

Update: I tried it on terminal and wrote the code using plaintext on notepad. It works. So the site is broken.

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I have the same problem!

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You are missing part of the #include line!
To correct reinput as follows:

#include <iostream>

That should fix it!

You are missing part of your #include line!

Try this:


That should fix it!

Well I try to reply but It leaves out the part that type that was missing so I will try it.
One more time!

Add this to the include line.
At the end #include
Line, note be sure to put a space the add the

I hope this displays well so you can fix it!

I think that # character may be the cause of the display as I do not know how to write within these posts.

Hello, @web5769346207.

Welcome to the forum.

The posts that you are replying to are from April, so likely they have figured out their issue by now. The issue you are having trying to type #include <iostream> is due to the way the forum marks down what you type. In order to include code in your post, please follow these guidelines: How do I format code in my posts?
I edited your original post to show your code correctly. You should also note that the user you are trying to assist had the same issue, and actually did type #include <iostream>.

Ok, thanks. I was thinking that was the case, But did not thinks that the Question was also effected. So thanks again. this is my first time posting to a form, but I did read the note on formatting. Just did not know in my head how to do it. But I will go back and learn how as I have just started learning Computer Programming Languages. My main reason for coming to you site, was to get some C Plus Plus Source code. But I have found you Free Course lesson very helpful. As a interesting note, while viewing some code and adding some code from my Open Office Write Program I Found that some thing was wrong with Open Office because when it type the keyboard character " and then some text and them "
I found that the first " was not the same as the last ". I find that very strange. I have not reported this to Open Office yet!. My Pc works fine while using your online course. so the PC!
Well Thanks again. Looking forward to more interaction on the codecademy Forums.

1 Like

I have written mine exactly like the example


but this is what comes up


why does this happen

You are trying to run two commands on one line. You use g++ filename.cpp to compile. Then after that operation is complete, run the executable by typing ./a.out.