How to solve "Unresolved inclusion: <iostream>" in a C++ file in Eclipse CDT?

Question

I download eclipse for c++ (cdt-master-8.0.2.zip).

When I write:

#include <iostream> 

It marks:

Unresolved inclusion: <iostream> 

How can I fix it?

Answer 1

1. Click Project → Properties.
2. Expand C/C++ General.
3. Click Preprocessor Include Paths, Macros, etc.
4. Click the Providers tab.
5. Check CDT GCC Built-in Compiler Settings.
6. Check Use global provider shared between projects.
7. Click Apply and Close.