[Solved] Is ‘using’ keyword a preprocesor directive?

Why do you think a keyword is a preprocessor directive? They are two substantially different things.

To make it clear, a preprocessor directive always starts with a hash and must occupy at least a whole line. A keyword is instead a “word” (may contain underscores). So they have no commonness.

Your answers:

Is the directive using a preprocessor directive?

No. It is a directive but not a preprocessor directive

Is it handled by the preprocessor or the compiler?

It’s handled by the compiler, as a “directive” for name lookup.

Also, what is a directive?

You can safely believe whatever that doesn’t compiles into actual, executable code is directive. This is a very broad question and a full answer won’t fit here.

You may want to look up “directive” in a dictionary.

Is ‘using’ a directive or a keyword?

Both.

Am I right in understanding that All directives are not ‘pre-processor directive’ but all preprocessor directives are directives?

Probably right. That makes sense.