Could their be more than one proceser directive in one c++ programme

Answer 1

You will learn more than iostream from the C++ course.

Here are some extra resources

https://www.sololearn.com/discuss/459759/?ref=app

Answer 2

Yes.

Answer 3

#include for Headers are not just the only preprocessor directives.

We also have #ifndef, #define, #if, #pragma, etc.