[plt-scheme] Does the procedure know who called it and how manytimes?

Chongkai Zhu wrote:
>
> In this case, I suggest you to have the SIZE function take one more 
> arguments, which tells whether it is called by itself or not (and if 
> you need, how many times it calls itself).
>

You can let this extra argument have a default value, say 0 or #f (by 
using opt-lambda), so other functions that call your SIZE don't even 
have to notice its existence.

> Chongkai
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