在 C++ 中包含头文件

Question

I'm very new to C++ and I've just figured out that main() is meant to call all the header functions.

I've made 5 header files, all .hpp, and placed them in the header folder of my project. As you can see they all have the same extension and location:

But when I call the header files in my main.cpp file... only getline_demo.hpp can be found by the system:

The error is "cannot open filename.hpp" for the others.

What could be happening and how could I fix it?

Answer 1

There are multiple ways to solve this:

1) Easiest: just put the fullpath from disk

#include "C:\... "

2) Inside the properties of the project C/C++ -> General -> Additional Include Directories the full path to the folder containing the files

2') You can use macros that specifies the project dir, solution dir ...

Answer 2

The main() function is not meant to "call all the header functions" .

You don't have any error here (assuming your files are in the same folder which seems to be the case here).
You are using the Visual Studio Code's editor. It seems that your editor is misconfigured and could not find the files in its own file tree representation, that's all.

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EDIT:

If you have an include error at compilation, then this is that you missed to specify the paths correctly. For example, if you have the "main.cpp" alongside an "include" folder that contains your .hpp files, you will have to include the one you want this way:

#include "include/my_header.hpp"

Always give relative paths .

Answer 3

From your screenshot it looks like getline_demo.hpp can be fond by your IDE, check using your file explorer where the files are placed and move the others into the same folder.

Never use absolute paths in your project/source files unless you want to cause problems for yourself and others in the future!

Also remember that the views IDEs give you of your project may not correlate to the layout on the filesystem - which is the layout your compiler cares about!

Special thanks go to Microsoft Visual Studio for the "helpful" filters it creates.